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So I was always curious, for anyone who knows, do we want to have the least amount of backpressure or more backpressure? And how is too much backpressure created in the exhaust? By restriction or restrictive items?

I was just wondering this.
 

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yep , restrictions in the exhast create back pressure . Most people think that you need some back pressure for torque . I sayfor a modified car , the less back pressure the better . torque is easily fixed by the right set of gears .
 

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I agree , thats why I said on a modified car . the optimum size would be dictated by the engine .
 

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i agree, unless you have a power adder, then you can have 3" - 4" pipe no problem if your pushing the psi
 

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O.K. since most of us don't drive race cars, what's the max diameter you'd want for NA cars. What's the stock diameter on my 04 H pipe and what would be a good step up for another H pipe. Thank's!
 
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