When comparing the exhaust sounds of 2002Z4CSS and GTOBOY455 the street pros sounded louder and more throaty. I have the Street Pros on the GTO and have Race Pro's for the LeMans but not installed so Im not sure the difference in sound in person. I really like the Street Pro sound. I haven't had the time and Im afraid to try to take off the stock manifolds off the LeMans and install headers,as my luck the bolts will break in the heads, then I'd be pulling the engine to get them out, then while the engine is out I'd want to clean up the engine compartment up, so the snow ball will start. Both sound great guys.
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