Here is my take on it. 1st, every car that is dynoed at KDR has higher than usual numbers, this is not a knock on the shop at all but simpley every car I see dyno there has higher than usual numbers. Either he is doing something incredible no one else is doing or his dyno is generous, Ill let you decide on that.

Id be interested to see you dyno it at another location with the same type of dyno and see how similar the results are.
2nd, I made 295rwhp on 8lbs back in 02 or 03 and no one believed me. Auto/Manual swap car, stock ecu, 8lbs, sequential, full 3 inch exhaust with a carbon ti muffler, pettit intake, simplified sequential, greddy pullies and I think a pettit underdrive pulley but cant remember. I dont think I have had a car to this day that pulled like that one on 8lbs. Before I sold it I installed a pettit ecu and ran it on 14lbs(didnt know better back then) and I swear that car had to be making close to 350rwhp as it pulled like no other stock sequential car I have been in since. Some cars/setups just work better than others, sounds like yours is running good.
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