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Looks like I'll be going to the track towards the end of Feb. and I wanted to have a couple things installed by then. I already have K&N FIPK (installed), I also have the o/r prochamber (not installed yet) and I was debating ordering the LMII catback. Now according to the link below, the K&N with pretty much any catback will run somewhat lean, but I will also have the prochamber to add to that and this might cause a leaner condition. Can anyone, that has dynoed their car, confirm that the intake/midpipe/catback combo will run too lean for comfort? Would running higher octane (100LL) prevent detonation? The reason I ask is because even when stock, I had the car dynoed to get a baseline, on the third run it was pulling timing at high RPMs.