Be very careful when tightening the nuts on the brass nipples, I didn't think I had tightened to much but the brass nipple broke off anyway, now I'll have to solder my coil wires to it and hope they stay. Don't know if this is covered under warranty, maybe someone here at CBX Performance, where I purchased them might be able to help out with some suggestions on how to fix it. Otherwise, installation wasn't too bad, don't know yet about performance increases if any.
[3 of 5 Stars!]
