i was thinking about purchasing my families realators nsx. it is a 1996 midnight pearl w/ 49k mile for around $40k. it has the comptech exhaust, headers, supercharger, suspension, brembro grand-turismo brakes, volk le 37's and other modifications. the car was originally from new york. the question i had was, do the older handmade comptech parts like headers and exhaust make a slight rattling noise. when i drove it the rattling went away but at idle it rattles a little. the owner said that that was typical with the handmade comptech products? also the check engine light is on because their is no cat (test pipe installed) is that typical? owner sad it checked out fine at the tuner. And last, the engine management seems to hold back when the car is floored engine seems to shut down from the boost, unless you turn off the traction control.