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I have a custom ECU tune along with a Remus exhaust installed and have noticed a considerable difference since the tune. While I did not have a dyno to test it out. The tuning company has dyno tuned cars x5/x6 3.5's on the West coast and they have found gains of 74hp and 82tq. I will eventually dyno mine and provide an accurate reading. I will say that since the tune my truck is like night/day difference! No hesitation or lag, and it truly moves out now!! Much more fun to drive now!!
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