On a stock engine with a single exit exhaust, a regular flow cat would be enough back pressure, since the exhaust pressure is less. When you start more engine/HP mods with more air in, you get a higher exhaust flow, which needs higher back pressure to properly operate. With a stock engine, you don't really need that much back pressure.

 

Sorry if that rubbed you the wrong way...wasn't my intention. I don't need anyone to substantiate my ideals regarding exhaust set-ups. I was just trying to help the guy out with some info based on my exhaust set-up and what I know to be fact, not speculation. I regard everyone's opinion equally and can agree to disagree. I am not like others on here who have to have everyone agree on what I say. If I ask a question, it is because I take every opportunity to pick up more knowledge if someone has first-hand experience.

Sorry for jacking this post...

 

No, you would be fine, except for the extremely annoying drone inside your cab.

 

well its just until i can put on pipes coming out of the muffler im doing my exhaust step by step so i was just wondering if it would hurt

 

Contrary to what most people have stated, I do not think that the exhaust would be EXTREMELY loud to the point that he would get pulled over all the time. My roommate has the stock exhaust system on his dodge except he has removed the muffler and installed a pipe in its place (and left the cat on). It is by no means ridiculously loud. Heck, I think my stock cat with a flowmaster is just as loud.

But one things for sure, it doesn't sound as good as a flowmaster

 

my 95 has headers a custom y-pipe in place of the cat and a flowmaster 40 series that ends right under the passenger compartment. I like it and have not been pulled over. but it does seem to me that the 360's are louder than the 318.

 

I ran my truck for 2 years without a muffler. And i assume the guy i brought it from had it that way too. I got pulled over once for speeding, and never for the noise. I think the truck ran fine, i never had a problem with it. It was kinda loud, but did more rattling and crackling.

 

i am currently running without a muffler.. just the cat.. and i have not gotten pulled over for it. I have been pulled over a bunch of times and only one cop has ever noticed. I like the sound... it isnt ridiculously loud but you know its there. The sound is choppier if you dont have a muffler but i like it a little louder so i took off my flowmaster.