If you want to continue to track the 335 with more boost, you may want to look into methanol injection. It significantly reduces intake temps and exhaust gas temps and allows you to run elevated boost levels. With just a tune, dual cone intake and meth, a 335i is at the 400 RWHP level at just 16.5 psi...and the best part is, intake temps and oil temps should be LOWER than running stock lap after lap after lap...
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