Yes if you are not happy with xtreme try the sport. Now I do not have a dyno of just a downpipe upgrade but you should pick up about 10-15hp
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I am in the same spot and not sure if i want the full corsa extreme. I like a loud exhaust but i dont want it to sound like i am riding around in an obnoxious noise box. What would the sound difference be between the corsa muffler with stock resonator and the stock muffler with corsa resonator delete?