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My car is an 01 Z06 Borla stinger
Last year I made a few changes
Forged stroker ,383, low compression, blueprinted, headers, 1 7/8" , no cats, clutch, fuel pump,
A&A sc, 8 rib and more
It is so loud...around 650 at wheels
Please recommend some mufflers . I don't care if it loses some power
Is it actually too loud on the outside or too loud on the inside (aka too much drone on the highway around 2k rpm)? If drone is the issue Corsa Sport will be the mildest option you can buy on the inside:
Your stingers have mufflers already, they just are not all that good at reducing the volume. If you want to reduce the volume output on the outside you can add some resonators.
If you can fit it, I cannot recommend Vibrant Ultra Quiet Resonators enough. On my wife's car, it was ear-shatteringly loud. We put only one of those things on her car and it tamed it almost completely. Still a noticeable presence but, massive improvement in sheer volume and harshness.