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I would think that my Soul long tube race catless headers and a Milltec muffler is more like 15 HP. The Softronic flash, race 78 mm throttle body and Plenum certainly pulls it all together nicely. I would guesstimate is about 308HP @ 6700 rpm at the wheels. I did this to improve the flat spot in torque around 4500, which it certainly did. I have had no problems with this system in 4 years of use.
What does the exhaust smell like in city driving or do you just track the car?
 
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