How much power do engine mods yield?

Serj22 said
Turbo mufflers sound nice, but turbo-chargers sound better... much better piece to put in the exhaust line IMO...

Guess that's your perogative, sounds like a diesel and a leafblower had a baby to me. Plus it don't have a cool lumpy idle. If I wanted something that whined all the time I'd get a wife, but to each their own I s'pose! :D