Im hearing an odd noise at about 6500 RPM, sounds KIND of like a manhole cover being dropped on the ground, just not as loud/pronounced (still audible and seperate from regular engine operation) I really only hear it on decelleration.

I have ordered an APE CCT (last week, out of stock, ships next tuesday) so Im PRAYING thats all the problem is, but figured I'd ask, to see if its normal or something since thats roughly where the powerband starts.

thanks.

 

valves maybe?