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The outlet on the stock 3400 rear manifold is just about 2.5", so that would be a good thing too.
My 3400 runs a 2.5" downpipe which then flares out to a 3" catalytic converter, muffler, then right out behind the drivers door. Might be excessive, and noisy.. but i like it.
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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