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Do I need back pressure? If I reduce back pressure = Performance gain?
Or do I need some back pressure? I am running stock everything except my air filter. I read on the net less back pressure= more performance. Someone please enlighten me? ((2nd Gen 1.9 Manual))
 

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It's only good to lose so much back pressure. Back pressure gives torque but kills hp. It's pretty much agreed that 2 1/4" exhaust flows the best for our motors if you don't have a flow through muffler. If you have a flow through you will lose some torque.
 
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