I'm running a medium tweaked 2.7 with Timecerts, Racewear studs, "long rods", RS-spec P/Cs, C-6 Web Cams, Weber 46s, and an MSD box. It doesn't seem to have much problem scaring me. It has dyno'd 210 at the wheels. It can be a bit fussy if you're over 7000 feet, or when it hasn't been driven for a bit, but it'll put around on the idle circuits all day in townafter it's warmed up. Makes me wonder what an MFI 2.9 twin plug would do...