Originally Posted by dhopkins8

Thanks for the reply. I thought that 1 copper and 1 alum shim was 30%. If not, how much performance would I lose by adding another .1 shim? Would it even be noticable? Also if that is the case, is it worth running 30% and adding a shim or leaving it alone and running 20%. I don't know much about this stuff but I am slowly learning.

Thanks

Dan