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how much did you find the JRRH for?

Different exhaust don't account for much, but make sure to check the piping. I recommend 2.25 (stock size) or 2.36 Keep in mind, a RH will make the exhaust twice as loud so I wouldn't end up getting hks, greddy evo, or some other loud ones.
 

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if you have the stock base exhaust, it will still be just as quiet. I would definitely recommend getting a cai (injen for easier install or aem).

The highest gains I seen in the JRRH is 13 whp. They also included an exhaust though. Gains should still be around 10 though.
 
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