Correct exhaust size?

[Skunksmash]

Originally Posted by slimneverdies

I'm also curious to this. I don't need them but wouldn't mind throwing them on to help with pollution and that horrible carburetor gasoline smell. But do they or don't they kill some of your performance??

They'll definitely improve performance, over stock cats. "High flow" ones, that is. I don't think this is what's called a "mini cat". Or a "high flow" cat. But like he said, its a lot higher flow than the old junkers like the one I have on.

Originally Posted by kalbert

If you have foul smelling exhaust, you'll overwork the cat and it'll melt down into a solid lump and plug up in one trip. A properly tuned well running engine is required if you need/want to use a cat. A modern converter has virtually no impact on performance, provided it has not been abused.

Anything that's not a straight pipe should be some hindrance to flow. I've seen the inside of the new ones and they're not a straight through flow design. Granted I don't know if its enough of a restriction to slow down the flowing gas. But it sure looks like it should.

Mine's not foul smelling either, just the exhaust fumes are quite noticeable. They just smell like normal fumes. But when you stand in the right spot, they seem a little... much. I ordered it and I'll report back if the cat helps this, I'm making a guess that it will help some. But I'm replacing it because the truck is displaying typical symptoms of an impedance in the exhaust.