The best this engine has run more power and torque.The exhaust sounds good also. If you want to wake up your 6.5 I would highly recommend this power package. Lower cooling temp no fan noise.
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From: David S.

I waited a while to write this testimonial.I had my doubts but after almost 9 months and 12,000 miles my 6.5 TD has not skipped a beat.I can't thank you enough for such a good product.I have told everyone I know with the 6.5TD about the FSD Heat synch...
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From: Kevin C.