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Of course it was designed to be a flywheel number. I have never seen a manufaturer try to sell a vehicle with hp ratings at the rear wheels. Sure seems to help pump the sale when you can say it has 300hp instead of 225hp or so. Like I said before, most of the P-51 dyno sheets I have seen place it right around the 450rwhp mark.
Dyno numbers will vary so drastically. I have seen this with my car. On one dyno it makes xyz the next its abc, same mods, same gas, similar days, etc. I wouldnt get too wrapped around the axle and advertise a specific number because Joe Blows dyno might show you making a completely different number. I agree with previous posts, dynos are good for a ballpark estimate. Those numbers will change just about every day... JMO
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07 Roush Stage 3 #07-250
02 Saleen S281 #02-331 GONE
04 Mystic Cobra #386
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