The BMW 335i stock Exhaust system is a very functional one with little room for improvement. The German version of the Exhaust is different than the US for obvious reasons. Since we are in the US we will discuss the US version of the 335i Exhaust. When they created the 335i Exhaust System they hit their goal right on the mark, you have to wonder how could you make something that is already perfect better, well you have to think on BMW's side. What do you think their goal was when creating the 335i stock exhaust system. Well BMW when creating the 335i was obviously creating a great performance sports car, so the exhaust they were aiming for had to provide sufficient back pressure, and release enough exhaust and at the same time all the pressure must work well with the 335i twin turbo chargers to provide maximum horsepower. This was goal number one for the 335i. By Bringing this car to the US, gave them another goal, and this goal prevented them from making the exhaust perform the way it should. US emissions are strict, and don't get me wrong if they wanted to they would have created an exhaust that gave the car 350 HP if they wanted, but the 335i would not be ok for US emissions. This is the reason the 335i only has 300 HP. Not only because of the exhaust, but because of how it was built. The 335i twin-turbos are not performing to half of what they could be and the exhaust is just accommodating for that. By adding an aftermarket performance exhaust you are doing what BMW could not, you are giving the car more room to breath basically. Now in previous articles I have mentioned that this car is still tuned to US specs so by adding a performance aftermarket exhaust you may only get minimal gains. Why, because in order to get sufficient gains out of this vehicle you will need to upgrade 3 things at once in the beginning to make them all perform to their maximum:
- 335i Software/Chip Upgrade
- 335i Air Intake
- 335i Performance Exhaust
The 335i performance chip upgrade will tell the car how much air to pull in and let out, it will also make the turbos increase PSI. By upgrading all three of these at once, they will all work seamlessly together, because the air gets pulled in through the intakes by the force of the 2 turbos, and is brought through and eventually coming out the exhaust, all being guided by the computer.
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