sorry, i shoulda said so but it's an n/a, i spoke to one of the rx guys in town today and he said it could be carbon burning off, could be my cat, or it could be a pinhole leak (coolant). what do you think? i don't know about the other two but if it were coolant wouldn't a lot of smoke me a big loss of coolant? also, the fact that i doesn't happen untill exactly 4500 rpm kinda bugs me. any ideas? thanks for responding so quick by the way.
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