Dumps vs Tail Pipes
#2
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It really depends on what kind of dumps you are talking about. If you dump right after the headers, yes, chances are you will see a performance loss due to a big drop in backpressure. If you are dumping right at the axle, however, I don't think that you'll have a significant change in performance at all.
#4
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One of the biggest advantages with dumping before the axle is weight savings. Depending on the type of piping and muffler, you can save 20-30 lbs! So, by saving $100 or so by NOT getting pipes, you also get a faster car under accelleration!!