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That system was designed around Kooks headers so my guess is it's just "mismatched" if you will, I know Kooks did ALOT of harmonic tuning on these thats why they took so long to get to market IE the flex joints for AFM noise ect. Do you have cats?
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TIGGERATOR
I don't think "mismatched" is the word I would use when even Kooks agrees that there isn't much difference between the two systems. More than likely it's the packing, or lack of, in the muffler itself. Supposedly Kooks is working on another muffler.....so we'll see. After I go to Corsa Friday, the stocks are going back on. Between the drone and the twang I can't stand it.
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