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Old 02-09-2013, 11:07 AM
Alpha67 Alpha67 is offline
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Cat size suggestion?

I'm about to pick up a pair of cats to go with some long tube headers for my truck. I understand the cats need to be as close to the heat source as possible, so I'm going to bolt them right at the collector.
Question about size though; I'm going 2.5" dia. for the mufflers and exhaust bu t my collectors are 3". Should I go 3" cats and reduce to 2.5" after? Does it matter?
Engine is a 5.7 stocker now, but have plans for a 383 stroker down the road.

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