Penetration before detonation
Alright, reading all those Pypes 409 posts had me wondering... unless you're located in a part of the country where emissions testing is mandatory, why would you ever keep cats on your exhaust? I mean, if I'm going to buy something to flow better, why would I keep something on there that impedes flow? And, on top of everything, they're more expensive! I'm not trying to step on anyone's toes, I'm just curious.