modbargains.com > Expertise Center

Here at modbargains.com we want to share our expertise with YOU. Our expertise center can help answer questions you may have about either a specific product, what a part is used for, and even some DIY Guides. If you are unsure of exactly what mod may be best for you, check here and then give our Modification Experts a call at 714-582-3330 to get the really detailed info.

Wheels | Exhausts & Intakes | Suspension | Engine Performance 

Exterior | Brakes | Interior | Lighting



General Tire & Wheel Information

Wheels are a complex piece when you consider the breadth of wheels offered today. This section is specifically for general wheel information such as wheel widths, offset, bolt patterns, selecting the right tires, tire recalls, tire aging, conversion, specifications and more.

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Wheel Construction

Not all wheels are the same. Wheels can be comprised of one, two or three parts and can be manufactured in several different ways, and depending on which wheel casting process was used, the wheels can have different strength and integrity. This section covers topics such as gravity casting, low pressure casting, flow-forming technology and forged wheels.

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Wheel Fitment

Learn about wheel fitment and mechanics in this section. We cover topics such as rolling resistance, wheel and axle science, force, friction and more.

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Air Filters

Air filters allow air to enter your vehicle's engines' gullets, while blocking the dirt and debris the is harmful for engines. Air filters need to be replaced frequently in harsh conditions such as the desert, but the general rule is to change your air filter every 3,000 miles.

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Cold Air Intakes

The reason people choose to replace their OE air filter system is primarily to increase the engine power of their vehicle, by supplying their engine with dense cold air. Aftermarket air intake systems also help save money when you clean and reuse the air filters.

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The cat-back exhaust is a piece from the outlet of the catalytic converter to the end vent. A typical cat-back exhaust system includes the muffler, muffler to converter pipe, and muffler to end vent pipe. This section includes general information about cat-back exhausts, including tuning them to change them to enhance the sound.

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A downpipe is the pipe directly after the header and before the catalytic converter. Downpipes feed exhaust gas to the turbine in a turbocharger. Every turbocharged engine needs a downpipe. An aftermarket downpipe is used to replace the stock catalytic converter with a better flowing unit.

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Intake Upgrades

There are several ways to add extra performance to your vehicle. One way is upgrading the air intake system and optimizing the performance of your intake.

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Springs are used to lower or raise your vehicle. With lowering springs, it's possible to remove the body roll and nose-dive, and improve your cornering power.

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Shock absorbers dampen the motions of a vehicle up and down on the springs. Semi-active suspensions include parts such as switchable shock absorbers.

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Coilover is short for "coil spring over shock". A coilover consists of a shock absorber with a coil spring around it. Coilovers come pre-built and are replaced when the shock absorber leaks.

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Engine Tuning / ECU Tunes

Since the start of computers being built into vehicles, vehicle tuning has come a long way from soldering another chip onto the factory motherboard. With today's small, powerful and inexpensive computers readily available, this advanced technology now controls nearly all of the engine's operations, such as spark timing, fuel injection, poppet valve timing, boost control, anti-lock braking, automatic transmission, speed governor and more - and often is interconnected to another computer that controls the body/interior of your vehicle. This section will explain some of the tuning options available.

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The intercooler helps keep your engine cooler by using a heat exchanger after the intake air passes through the turbo but before it enters the intake manifold, cooling the incoming air charge, which increases the efficiency of the induction system. A decrease in intake air charge temperature means the incoming air is more dense, and therefore richer in oxygen. Because the cooler intake air charge has more oxygen than hot air, the engine can then make more power.

While an intercooler itself does not actually "make" extra horsepower, instead, it allows you to achieve your maximum horsepower potential and make that horsepower consistently and for a longer period of time before becoming overwhelmed by heat than the OEM unit. This section will get into the nitty gritty of how intercoolers work and how different characteristics affect the performance of an intercooler.

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If you've been wondering the science and tuning behind turbocharging, this section is for you. Turbochargers and superchargers are "forced induction systems". These work by compressing the air flowing into the engine. By compressing the air and forcing it in under pressure, it stuffs  means more air in the cylinder, which means you can burn more fuel - putting out more power per cylinder.

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Upgraded Turbochargers

The OEM Turbocharger is selected with cost and efficiency in mind and often is on the smaller side - with a tuned turbo car, at a certain point the turbocharger itself becomes a bottleneck and so replacing or upgrading the turbos becomes necessary.

The large turbos typically put out more power during high RPMs, while smaller turbos don't put as much at high RPM range. Small turbos spool quickly, so many manufacturers use small turbos as stock to combat lag. Larger turbos take a little longer to "spool", but can deliver more boost, and therefore much more power. 

Upgrading the turbo can be done by either installing a superior turbocharger or by retrofitting your existing turbo with a more efficient impeller wheel to create more thrust. You've got quite a few options, so you'll need to find the ideal balance that is specific to your driving style. This section will explain the types of upgrades available and what the pros and cons of each are.

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Oil Catch Cans & Oil Coolers

All turbocharged cars, even brand new, will have some oil blowby when the engine is under boost. This means that under boost, oil vapor will enter the intake manifold and droplets of oil collect on the intake manifold, intake vales and intake ports, trapping dirt and dampening response. 

Oil coolers are made to efficiently and economically reduce high oil temperatures in vehicles. The purpose of an oil cooler is to prevent "cooking the oil". When motor oil exceeds the temperature it was designed to operate at, it rapidly loses its lubrication properties, which is bad news for your engine's longevity and performance. The Oil cooler helps by cooling the motor oil down to keep it safely within its operating temperatures - staving off damage to your engine or potentially triggering "limp mode" when the oil gets too hot. These coolers are typically made of aluminum. 

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Motor Oil

Motor oil prevents all the metal surfaces in your engine from grinding together. Engine oil also prevents oxidation of your engine, which happens at higher temperatures. Motor oil has different grades which defines the viscosity while hot or cold. To keep your engine free of sludge, you must change your oil periodically. If you don't change your oil regularly, black sludge from the oil will eventually "bake on" to the engine. There are even some motor oils that include minerals and synthetic oils. If you are swaping oils or removing sludge, you may need to flush your engine. All this and more is covered in the Motor oil section!

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Front Splitters & Spoilers

A front splitter is used to balance the front vs. rear distribution of downforce. The splitter is used to increase the area of high pressure above, so there is low pressure below. The objective of a splitter is to decrease pressure and increase velocity.

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Rear Diffusers

Rear diffusers - in a racing context, at least, are used to generate downforce, which helps keep the vehicle firmly planted to the road at high speed, and balances the need for grip and stability with velocity. However, most diffusers for street cars (with a few exceptions) are primarily intended to change the appearance of your vehicle. A different diffuser can allow you to run an alternate exhaust configuration or add an aggressive accent to the rear end styling of your vehicle.

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Rear Spoilers

Originally, spoilers were developed to help create downforce to keep a race car planted at high speeds - the spoiler is the grandaddy of automotive aerodynamic devices. A spoiler functions by creating drag, altering how airflow behaves across the surface of the vehicle, thereby increasing downforce. 

While most spoilers for street cars are not aerodynamically useful, even the simplest spoiler intended for styling use only will create SOME drag. However, as with diffusers, the majority of those for sale are not aerodynamically effective for racing use. That said... A trunk spoiler can really help balance out the exterior of your car and help round out the rear end aesthetics as well as the side profile, and often are available in carbon fiber or can be had in body color.

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Brake rotors are used to stop your vehicle. Brake pads clamp down on the rotors to slow the wheel from spinning. In this section we discuss various types of rotors such as slotted brake rotors and drilled brake rotors.

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Brake Pads & Pad Compounds

Brake pads, and the compound they're made from has a dramatic effect on your braking performance. The brake pads mount inside the caliper, and are what "grabs" the rotor itself to slow your vehicle during braking.

We offer a variety of brake pads to suit your driving style, from OEM Replacement, Low-Dust pads to Ceramic High Performance compound pads. A track compound pad will perform at its best when it's extremely hot during trackday use, but lack grip when it's cold like during street driving, and conversely a street pad will perform great in cooler daily driving conditions, but will often be overwhelmed by just one trackday session.

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Brake Calipers

Brake calipers are used to slow the wheel by creating friction with the rotors. Performance brake calipers replace the OEM calipers with performance models fitted with additional pistons in the caliper to apply greater braking force.

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Big Brake Kits

Big brake kits are a complete replacement of your OEM brake system. Big brake kits usually include new rotors, calipers, pads, and brake lines. Use this if you want to completely upgrade your braking system.

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LED Lighting

LED lighting is bright, clear and crisp. Take your vehicle's interior to the next level with long-lasting LED lighting.

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Carbon Fiber Interior Trim

Carbon fiber interior is light, sleek and strong and helps give your interior a bespoke, motorsports-oriented feel. Give your vehicle a cool look with carbon fiber interior trim.

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OEM BMW Floor Mats

Avoid getting your carpets dirty and give your interior an extra styling accent with a set of OEM BMW Floor mats.

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High Intensity Discharge Headlamps & Retrofitting

High Intensity Discharge (HID) headlights deliver an output approximately 3 times brighter light compared to traditional headlamps. Use HID lights to instantly increase visibility during night driving. HID lights are easy to install and is a quick upgrade to make your vehicle look cooler and dramatically enhance how well you see at night. HIDs are available in a variety of colors to suit your tastes, but 4300-5000k color temperature bulbs will deliver maximum visible lumen output.

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LED Tail Lights

LED tail lights are energy saving, long-lasting and brighter than your traditional tail lights, and give any car a modern 'facelift' instantly. It's easy to enhance your vehicle's style with LED tail lights with brilliant illumination and cleaner styling than OEM incandescent-bulb lit tails.

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Angel Eye Upgrades

If your BMW came stock with "angel eyes" or "halo" rings in the headlights, the OEM bulbs lighting the halos are yellowy incandescent bulbs that give the halos a dim, dirty appearance. Solving the problem is easy, though - Upgrade your stock yellowish angel eyes for bright, crisp white (or other color) angel eyes that really stand out at night. LED and HID-lit angel eyes are brighter, their lighting components last longer and the clean lighting will enhance your vehicle's appearance.

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LED Turn Signals

LED Turn Signals are brighter than incandescent bulbs, use less energy than a traditional bulb and the clean, crisp light output enhances your vehicle's appearance. Best of all, LED turn signal bulbs are one of the easiest mods to install.

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Bulb Application Guide

There is a wide range of bulbs out there for cars, and it can be difficult to figure out what the right bulbs are for your car. Need to know what bulbs are right for your ride? This guide will help you find the bulb you need for your vehicle.

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