So you have a BMW M3 E90 or E92 and want more horsepower. Hey you might have another BMW, Subaru, Ferrari, Honda, etc, this still applies to you! To make more power, you have to let that engine breathe in and breathe out. The engine is like your heart. Clog an artery and the only place your going is to the junk yard! In this customers case he wanted to get more power and sound from his M3. So we added our Agency Power stainless exhaust system to it along with a aFe cold air intake kit. The exhaust I can speak about first hand as I had the same one on our Project BMW M3 E90. The V8 only gives you a little grunt at the top RPM. But with the exhaust, it starts sound fierce from 2000 rpm and up. What nice about the Agency Power exhaust is that it is a full bolt up system, that comes with beautiful polished quad tips, and really does make that mid to top end gain some power. You never want to take away to much back pressure on a NA motor. If you do, then you lose torque. One way to keep that throttle response snappy and the low end power in check is with a cold air intake kit. Lets face it, BMW and their M division have these motors dialed out. But you can still gain a little here and there. The aFe cold air intake kit does exactly that for the V8 engine. A complete replacement unit, it comes with a high flow air filter in a sealed box. Now if I were this guy, the next mods on my list would be a VR Tuned ECU flash and a underdrive pulley kit! Check out the awesome exhaust video and shop all BMW M3 Performance Parts here.