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What do you think I will be putting down with your tune, downpipes and catback exhaust?
The SLs we've dyno'ed locally have been making between 490 and 505 WHP depending on conditions. On a dynojet. I think you'd be right there- that's almost 600 HP figuring 15% loss ... which is probably a bit high, if anything. That's why we advertise the 550 PKG at 585 HP.