there have been a few ppl that have "freak engines" and put down high #'s, like jeff mentioned. however most n/a ka's i've seen are like what brian and russ mentioned. i just dyno'ed my ka this past weekend and made 142 whp and 143 ft-lbs with a custom intake, 65 mm exhaust, s13 240/248 cams, and timing set at ~24*.
as far as 200+ whp ka, i have yet to actually see one myself. the highest hp ka i've ever seen was on the speakman racing s14 which i saw running at road atlanta. i talked to the guys that ran the car and they said they ran 11:1 or so compression. the engined dyno'ed at 208 hp, so that would still be like 178 whp or so, which is right along russ' estimate
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