You have to dyno that thing! Really 221 hp is about right- you have to take in account that 260hp is whats at the flywheel- not rear wheels. You will lose 15% +/- 3% from flywheel to rear. I had my 2001 GT, when it was stock, dyno at 229hp. I bet if you have it dyno'd you will be close to that. What hp a car is advertised is always at the flywheel.
Sg
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2001 Blown GT(Black Beauty)
401rwhp/394rwtq
12.2@117mph
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