What issues will I run into if I have no muffler on my jk?
I like how it sounds, and I don't want to hear its illegal and that kind of stuff, I know that I'm just wondering if it will harm my engine? I have been told lack of back pressure is really bad?
What do y'all think?

 

I've been tossing this idea around as well too.... From my understanding you should still have plenty of back pressure due to the cats and resonator/s. Might want to add a turndown tip so you dont fill your JK with fumes though.

 

The question is will it void my warrenty if I do it or put on a differnt muffler?

 

That wasn't my question...

 

Why not just put the muffler on should there be any warranty concerns.

 

It's an easy swap so if your dealer is a PITA to deal with, just keep your stock muffler and swap it back if you need to take it in.

 

So back to MY question. Will this harm my engine at all?

 

No........


That was answered in post #2

 

Thanks, anyone else have input?

 

The day I got my JK, I chopped the muffler off. It sounded real good below 2,500RPM, but after that it just sucks. Lost a lot of low end power and didn't see a MPG increase really.

Just unbolt your stock muffler and drive without it for a while and see for yourself. Then you can always put it back on.