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just trying to approximate how much louder long tube headers with high flow cats will make my car. I have H-Pipe into roush axle back currently. Any input?

13000 miles cars not down on power in any way Tuned with an exhaust Catch can Anyone know anything about this?

I’m on Eibach springs and want specs for 19 inch wheels for flush fitment. Thanks in advance!

Stock on 93 i made 426 wheel. I just have a cat back exhaust and after tune made 436. Tuner said colder weather and not heat soaked he would expect consistent 440-445. much better low end power delivery.

i noticed about a week ago the my black pp1 brembos have gone almost completely grey with white splotches. Ive tracked the car once. Any One know what it could be?