Thread: do exhaust stickers improve performance?
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      08-31-2023, 10:29 PM   #3
M550bernina
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Originally Posted by BayDriverSF View Post
How many horsepower will it add if I put these stickers on my exhaust pipes?

https://www.ebay.com/itm/334945845882
Depends. On a mustang dyno or a dynojet?
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