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How much HP does a TRD exhaust system add to an 05 Scion tC?

stock everything but TRD exhaust system.

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  • 1 decade ago
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    you can get more HP by taking off the stock muffler than you can with the TRD exhaust. there was an article on google search and they tested it and by removing the stock muffler, more hp was gained over the TRD muffler. and the TRD is just an axel back, its not going to do anything unless you changed headers, s-pipe and mid pipe, and at that point its just worth buying a cat back exhaust from the get go. check out Dezod or Ptunings exhaust, those are probably better.

    Source(s): 05 Scion tC owner http://www.ptuning.com/ http://www.dezod.com/
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  • 1 decade ago

    exhausts don't give much hp, especially on small motors like tCs. I would try to focus more on forcing air into that motor. Turboed tCs can beat 300hp STi's @ only 6 psi

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  • 1 decade ago

    5-10 sounds awesome too

    Source(s): Own of an 08 Supercharged Scion tC(with the TRD exhaust)
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