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The 335I VR400 horsepower kit really starts to open up your N54 turbocharged engine. By adding catless downpipes and a racing performance exhaust system, the turbochargers are able to flow freely without any backpressure. By adding these exhaust components to the car, the horsepower will go up by 40hp giving you more response when the gas pedal is hammered. The Agency Power catless race downpipes are 304 stainless steel designed to bolt up to your stock turbochargers. They are larger in diameter then stock to help improve turbo performance. With the downpipes installed, the turbos are much more audible however this does not affect cruising speed cabin noise. In addition to the downpipes, we add our Agency Power catback exhaust system. This exhaust features a high flow muffler, titanium tips, and all polished 304 stainless steel. This exhaust system improves the overall performance by reducing back pressure and not creating substantially more noise. With the addition of the JB4 plug and play ECU and Injen cold air intake, we were able to take this vehicle to 400 horsepower at the crank. With a drivetrain loss of 10-15%, this is nearly a 90 horsepower gain!
We obtained our numbers using 91 octane pump fuel. Because the JB4 plug and play ECU has map switching abilities, horsepower can increase to over 400hp with the addition of 100 octane race fuel. For more on JB4 Map Switching, visit
. For further questions on this power kit for your BMW, contact one of our BMW specialists. N54 Tech here
BMW 335I VR400 Kit Includes:
JB34 Plug and Play ECU
Injen Cold Air Intake Kit
Agency Power Race Downpipes
JB3 CEL Eliminator
Agency Power Catback with Ti Tips