Quote:
Originally Posted by greddy91
I firmly believe that any source of exhaust restriction removal in a turbo car is not a waste. The bigger restriction removal the better. CC was my first target.
Every turbo vehicle I have ever owned has seen significant improvement from this strategy. The BMW was no exception.
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In the beginning I just had an Active Autowerkes canned tune (that I was very pleased with) and then I decided to add downpipes... Immediately after installing the DPs, I noticed a disappointing loss of torque, to the point that I considered putting them back on!
It took several tune revisions and Pure Turbos to bring the torque back. I was skeptical about doing the full exhaust, but this time it worked and feels more powerful than ever. Mine is totally a free flowing system with DPs and Akrapovic, but I'm still wondering if some back pressure would help bring back more torque?
...or perhaps the DPs eliminated enough turbo lag so that the sensation of having a hard push in the back as the car accelerated was less prominent?
