My TYGA pipes made less than 1hp at peak but lost 8hp in the middle. I never got the middle back and ended up going back to stock pipes.

However you cant beat them for price and being stainless is a huge bonus.

Yet to infact see any after market pipe beat the stock pipes on a stock motor so its nothing to do with TYGA. The stock pipes can be a little tricky to jet too though.
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If I have to take the carbs off once more...