what kind of h.p. and torque gains should I be looking at after a exhaust uprade??
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i'm removing the middle mufflers, replacing them with a resonater. replacing the crappy old oem muffler with a flowmaster and resonated tips?
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...the exhaust manifold, straight pipe, removing cat and resinator and increasing the diameter of the pipe itself. The more hp and torque you want the more stuff you need to change or upgrade. But you might feel a little gain in throttle response.
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...My 83 Urq has had the cat and resinator removed. In it's place from the EM to the stock Urq muffler is a three inch pipe. It may have given my car a 20hp boost (I might be high but not by much). That's what i meant. To gain hps from messing with the exhaust you would have to upgrade the whole thing from block to bumper and that may get you 30hps tops maybe more depending on how exotic your set up is. Real ponies are made from massive upgrades under the hood.
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