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[QUOTE="380EXCman, post: 759670, member: 16412"] We have been having this same discussion in our shop lately and plan on doing some Dyno tests. But I doubt it will make much of a difference at all. I saw a picture on the net a few years back of a new 520 EXC that had burned to the ground, as a result of a backfire. I will post back with results once we get it done. BTW, I got to take a spin on a customers CRF450 that we did a topend and kibblewhite valves on and I was pretty impressed. We had a bone stock 04 CRF 450 dyno at 47 hp pretty impressive considering my 04 525 made 48 on our Dyno, now the torque numbers were quite different.... :) [/QUOTE]
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