Like Pozer, I have no problems with my 944 (BCM's) using 11:1 pistons. I tried Bruce's trick of just rotating the timing plate back one notch to retard timing 2 degrees or so but it ran like crap so I turned it back to stock. Ran it that way for two years, no trouble. Ended up getting a set of DP Pederzini 2.1 ignition modules tres cheap last year and have been pleased with the result. It's only a 2 degree retard at full advance but it seems to run better (smoother) all through the curve. Idle and off idle is somehow better too although the specs say it shouldn't be any different. Maybe my stock Kokusans were flaky. To be clear, there was not much of a performance gain, it just ran better.