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What exactly is exhaust backpressure?

1151 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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there is such a thing as not enough back preasure, a pair of 4 inch pipes is going to hurt your performance if you are pushing 300 hp
um, 300 hp for a 302 is a modified car...
Fordgazm said:
I agree , thats why I said on a modified car . the optimum size would be dictated by the engine .
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