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1. 50-70 peak hp? No, but I follow Pray Performance on facebook and he's been able to get tune-only cars into the 10s because there's huge amounts of torque gained by a tune in the middle parts of the RPM range. maybe 25hp peak at most?????? I'll let others that know more chime in here.
2. Emissions tests these days simply check the computer for completed readiness tests and pending codes. As long as the tune isn't disturbing those processes or throwing codes you're good. Even a tailpipe test would pass provided that the tune doesn't cause an overly rich idle or some such. A tune is going to void your warranty though.
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2018 ZL1 Red Hot A10 (SOLD 1/21)
2001 Corvette Z06 Quicksilver Heads/Cam/Longtubes 443rwhp (SOLD 5/23)
2018 ZL1 Garnet Red A10 (SOLD 4/25)
2003 Corvette Z06 Torch Red bone stock 60k mi
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