USP Motorsports is a leader in auto parts for Volkswagen BMW VW Audi Porsche specializing in Performance Modification Tuning Repair Maintenance. VRSF N54 Cast 3 Downpipes 359. Free Shipping The Best QualityPerformancePriced 135i 335i Downpipes BMW N54 engine reliability, problems and repair. Powerful straight6 twinturbocharged N54 N54B30 was developed by Alpina in 2006 for fast BMW autos and crossovers. How After Market Exhaust Systems Can Disrupt Your Cars Power Curve. When you install a tuned exhaust system, your car, truck, or SUV feels faster and more responsive. If you install a mish mash of components, start cutting off various parts without understanding their function, etc., you may feel like youve wasted your money on a performance part that didnt improve performance. Usually, when an exhaust system disrupts your engines power curve, its because youve made one of the mistakes below. Dont go too big. A lot of vehicle owners make a mistake when they upgrade their exhaust system by purchasing exhaust pipes that are much larger than the factory set. With the exception of diesel trucks which can sometimes benefit from really large pipe diameters, most vehicles leave the factory with the correct size exhaust pipes. While the factory muffler might be cheap and restrictive, the engineers tend to do a pretty good job choosing the right pipe size. Therefore, stick close to the original factory pipe diameter dont add more than a half an inch in pipe diameter unless youre driving a diesel or youve made some major performance upgrades like adding a supercharger, for example. Note Exhaust tip size doesnt matter when it comes to performance. MTI3MzQ3OTQ1Nzg4MTYzODkzNw%3D%3D.2' alt='How To Install Downpipes 335I' title='How To Install Downpipes 335I' />As long as your exhaust tip isnt some sort of muffler tip combo, go as big as you can stand. The size of the pipe between the catalytic converter and the exhaust tip is what matters. If you want to know how big your exhaust pipes should be, check out this table of suggested exhaust pipe sizes. Dont go cheap. The cheapest mufflers on the market are essentially straight pipes filled with cheap fiberglass sound deadening materials. I Will Quit Mac Download. You can probably buy a set with the cash youve got in your wallet right now, and honestly they dont sound too bad when theyre brand new. How To Install Downpipes 335I' title='How To Install Downpipes 335I' />Unfortunately, theyre cheap for a reason. When these mufflers get hot like on a long road trip or a few runs at the track, the fiberglass stuffing inside the muffler starts to melt. Eventually, the stuffing breaks free and becomes an obstructionand your cheap mufflers get plugged up and start robbing power from your ride. Invest in a good set of mufflers from a brand name manufacturer see our list of exhaust system manufacturers. Think about sticking with the factory exit configuration. Are you thinking about adding a dual exhaust system to a vehicle that currently has a single exhaust pipe If so, you might want to consider the fact that converting a single exhaust system to a dual system isnt always a good idea. If youre driving a 4 cylinder, adding a dual exhaust system is usually a very bad idea because theres only one exhaust manifold exit on your engine. Unless youve got a very powerful 4 cylinder, theres not enough exhaust gases coming out of your engine to necessitate a dual exhaustand even then you probably dont need a dual. Dual exhaust exits only makes sense if youve got dual exhaust paths coming out of the motor. If your engine doesnt have two exhaust manifolds and two sets of catalytic converters one for each side, then it probably doesnt make sense to go with a dual exhaust. Building your own system without doing your homework. If you want to avoid paying big money for an exhaust kit, you can definitely build your own. Heres what you need to do Use mandrel bent pipes. Mandrel bends are smoother and more aerodynamic than press bends. If the pipes arent mandrel bent, any changes in direction will result in a restriction. The good news is that you can buy mandrel bent pipes online. Choose a muffler made for your vehicle. Mufflers should be chosen by looking at flow rates. Basically, you figure out where your engine makes the most usable power, and then you optimize everything for that point f youre a math wizard, you can check out this article on how to calculate muffler and exhaust pipe size. Fortunately, the muffler manufacturers have done the math and testing for us, so all you have to do is buy a muffler that was designed for your vehicle. Stick close to the factory pipe diameter. Lighting Pool Game'>Lighting Pool Game. A 2 dual exhaust system has enough capacity for a 3. Adding 14 of an inch to each pipe adds capacity for nearly 4. Going any bigger than 2 14 inch pipe diameter is usually overkill and will often cause your engine to lose power.