Quote:
Originally Posted by Xabiss
I really like my OFT, but I still cant figure something out. I have an automatic BRZ which I do regret purchasing now, but it is what it is. When I get to the 4K-5K range my engine makes the weirdest noise and as soon as I get to 5K it starts sounding normal again. 0K-4K also sounds normal it is just in that range. Is this normal? The engine noise is distinctively different in that one range of RPMs it is a little hard to explain. I can put the stock tune back on and that noise is gone at that range.
I always use 93 octane Shell fuel.
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This is an agressive change in the ACVS Exhaust to compensate for the torque dip with equal length headers.