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I run them on several cars including two 496 builds. Wouldn't have anything else, and as stated above, they do sound better with age,..they're very mellow, very muscle car, and completely different from the 'tin can' sound that a chamber style muffler makes.
2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2021 C8 of the Year Finalist Unmodified
2020 Corvette of the Year Finalist (performance mods)
2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
2016 C2 of Year
2015 C3 of Year Finalist
I'm running them on my 68 427/390. They are a little louder than stock and have no resonance. They are a good flowing muffler. It is a subtle muscle car sound that is nice. They are not loud like flowmasters. Actually would have liked them a bit louder but they are fine.