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Review on Gibson 421887 Superflow Stainless Muffler by Broderick Shetler

Revainrating 5 out of 5

Gibson is a great product

love Gibson exhaust products. It had a flyback system on the Chev Astro. More power and faster acceleration. Much less exhaust brakes. The temperature of the catalytic exhaust gases dropped by 100-150 degrees. The exhaust runs cooler. There's no difference in miles per gallon, but there is a difference in performance. I highly recommend Gibson.

Pros
  • Nice to use
Cons
  • old