Quote:
Originally Posted by BYprodriver
Generally speaking installing most catless headers will decrease low RPM torque which is what gets the car moving & the headers increase power at high rpm. That's why I sold my headers & bought Fabspeed sport cat manifolds for my 3.6 litre.
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I tend to agree there is a trade off with exhaust , I wonder if smaller tube straight headers ( no cats ) help with torque vs. larger diameter ? I made 252 lb ft of torque recently with mine and I have cheap Chinese headers , no cats , cat delete pipes and a stock muffler with PSE style bypass pipes . I also made over 282 hp at the wheels which would suggest my setup flows pretty well . Common sense tells me going with a larger diameter exhaust will yield more HP but " may " give up too much torque . It is a fine line . Have you dyno'd your setup ?
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