installing headers

My Mac LT's and Cat h-pipe fits like a glove. It has been all good with not one prob since Christmas of 2002. Still same header gasket, lol.

Grady

The difference between an aftermarket mid pipe with cats and an aftermarket one without is insignificant. Especially when you compare that to the jump up in flow over the stock mid pipe with its 4 cats.

You will get a LITTLE more muffling effect (quieter) with the cats, and maybe give up a bit of power. But not much.