Thread: VRSF Downpipe Installed without Tuning - No Codes!
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      09-17-2016, 05:50 PM   #25
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Quote:
Originally Posted by toastie View Post
Why wouldn't a tune add performance? I thought JB tuning would clean up the slack OEM left behind in terms of timing, boost etc...
Jb4 will add significant performance increase over downpipe on its own
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