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He will do whatever you want doing, and will improvise with whatever you want. I wouldn't go for 6" * 4" oval...they're massive and will sound too much. Kully thought he had a 6 by 4 on his car, so asked Charlie to replace it with a full cat back exhaust and put a 6 by 4 inch tailpipe on it...the size of it was almost like a backbox!!!!
He will do whatever you want as long as he has it in stock...which he more than likely will have.