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What exactly is exhaust backpressure?

1153 Views 8 Replies 5 Participants Last post by  Fordgazm1
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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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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