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I have a by-pass modified OEM muffler which physically limits flow into the muffler. As the flow rate increases more and more gas volume is force out the by-pass route as turbulence starts to block up the entry into the muffler. This is the theory anyway. I have also dropped my secondary cats(fabspeeds) but still have the stock headers. It is hard to tell but I think I have lossed low end torque and of course all hell breaks loose above 4K.
The sound is truly amazing but can give you a false sense of performance.... I often wonder if I have hurt the performance of the car. Perhaps I have too little back pressure for proper scavenging in certain regimes.
Also wonder what ECU flash would work best with this set-up.
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986 00S
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