Originally Posted by spideypm
is it possible to install the downpipe incorrectly and still not have the CEL on? I had installed the HFC downpipe and tested it with P-Box. The numbers that i got was actually slower than a fellow 335i owner running stock. Like I had posted before I could feel the car pulling harder at high rev. is there any sign i should pay attention to?
Could it interfere with JB? At the time of the testing I had hooked my car up with JB but i had switched the JB off. Tks!
I havent used the JB at all with our downpipe so i cant say what effect it has or not. I dont know if it effects any of the learning on the ECU? You do any baseline of your car before the downpipe? Thats the best way to tell as you are comparing the same care. comparing dyno numbers even from what car to the next will have some difference even. The % in gains is what is actually measurable.
Feel free to PM or email me so i can help you best as possible.