Hmmm...
I had a D&M spike that I put on my HD, but I couldn't make it work. The HD is bored to 96 c.i., has 10.2:1 compression, and uses a HQ39 cam. When ever I got over 4200 rpm at WOT it would run out of air and start spitting and sputtering. That sure pissed the OL off..
The ONLY air filter the HD will tolerate is a stage 2 Arlen Ness Big Sucker.
What puzzles me is that the BD is 117 c.i., and apparently is able to use a D&M spike. Is this because the S&S is only 9 point something to 1 compression ratio?