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straight pipe muffler on automatic er34

11-12-2005, 12:32 AM
I have remove my catalyzer and try to made my pipe straight down to a end muffler, but it seems that when I rev up to 5,000rpm it will drop a bit of power and raise up again. Some of my friends said I can't use a straight down pipe on automatic. Is that true?????? Please help me, anyone????

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