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I just finished doing similar mods - 2650R, 2" Kooks headers, both Cats removed, Kooks 3" full exhaust connected to AWE touring axle back exhaust and ... it's WAY too loud!
Fun yes, but not practical and will certainly exceed some track sound limits.
After reading this thread I bought the magnaflow 12469 muffler and I've been to 3 shops and none of them think they can make it work. They think it's too tight in the tunnel or will affect clearance. Two of them were also not keen on working on a car with no cats which could be part of it too.
I'm thinking of putting the OEM exhaust back (with valves) back in place hoping the suitcase muffler can take some of the noise down. On track, the valves will have to be open. I sure hope it'll put me under the limits else I'm not sure what to do.
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2017 ZL1 Black, A10
Build: Magnuson 2650R, 103NW Throttle Body, Rotofab Big Gulp, Kooks 2" headers, Catless, AWE Touring exhaust, JRE Smooth Idle Cam, Katech Oil Pump, Elite Catch Can, JMS Fuel Booster
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