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I would also be suspicious of chassis dyno results provided by the shop's that perform mods! It's in their interest to provide a rosier result than might be accurate. I have a 2010 Challenger R/T (5.7 Hemi) that was supercharged and more by a speedshop in Canada which their chassis dyno result graphs at 480 rwhp. For reasons which make for a long story I had to contact the supercharger tuner at Magnuson who too seemed suspicious about the dyno result. It doesn't feel like a 550 crank hp car to me (adding 15% to the rwhp #) even accounting for the fact it weighs over 4k lbs. On another note: AM I WASTING MY TIME WAITING FOR THE PRICE OF A C6 ZR1 TO DROP SIGNIFICANTLY?