thinking about buying a very nice 07gt, its a 1 owner car, 28,750 miles, the owners 1st mod was 4.10s and a high stall torque converter, right after he bought it, its got some exhaust mods too, its a 2007 gt, in 09 he had a vortec supercharger installed, its seen the track quiet a few times, 11.79 car, i like it very much but after the test drive i can hear a noise from the blower, kind of like a rattiling noise? then it goes away, its got a low boost and tune . the owner says it should go lotts of miles left, i dont know much about the 4.6s would you guys think he.s right? hate to buy it and have to put a new motor and blower in it, he is asking 22,000 for it. the car is really mint .