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Old 01-05-2013, 07:58 AM   #3
It was ninety nine cents!
Drives: 2014 Jeep Wrangler
Join Date: Jun 2010
Location: Syracuse, NY
Posts: 1,719
On a stock LS3 from what I've read the gains will be minimal, if even noticeable at all.

On an L99 however, the transmission is also re-tuned, which may not increase horsepower in itself, but it improves the shifting tremendously, which makes the car faster.

Most folks don't commit to a tune until they've added the basic bolt ons... CAI, LT headers, HF cats.
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