Well let me put in my 0.02 cts here. crimping the muffler tube on the B.C.M. will not work. you will lose a couple of hundred R.P.M.'s. I Tried it and noticed a big performance loss. i installed a cline regulator on my 1.60 and it work's great. it does make your needle settings a little more sensative though. but you'll be happy with the result's.

Also from what i hear like in the other post. guy's are running large fuel tubing and a large clunk.