UsmclovesXJ

...hmm I'd say a straight threw muffler will give u 15hp..and 3better mpg

jmm0122

Serious comment or joke?

94XjSport94

I'll end up doing the swap if i get the money/ want to spend it on that. I just ordered the FM 44 for 2.25 pipe so ill run that for a while till i want to upgrade. I'd love to see proof of it, thats pretty significant

jmm0122

There is no muffler that will give you 15 hp and 2-3mpg. If your lucky you are looking at 3-5hp and maybe .5 to 1mpg. It is a different story if you swap the 2.25 piping out for 2.5 and add header, and hi flow cat. But even then you would be lucky to see 15 hp.

UsmclovesXJ

Actually mate you do gain morethen 3to 4 hp on the muffler like around 8hp.maybe 2mpg. Add a cai you will get those 15 plus and improved mpg. Add 2.5 pipe and ur good

onlyinajeep726

Yea... 15 HP is not likely... I've learned a thing or two since I got my *** chewed by jmm0122, toogreat and Kyle 4x4 4life for my horrible guess about HP gain from my intake and exhaust modifications... please see page 29 of this thread. Never again will I pull numbers from my ***... lol.

94XjSport94

I meant the piping not the muffler, sorry lol i know that a muffler wont do that.

UsmclovesXJ

If u redo headers back then yes nice gains won't give u 15 hp with just the pipeing. Add a good cai. And bored tb and u can get 15 horses.now the most ur gana see is a nice tourqe incress not a lot but a nice amount to knowtice

jmm0122

Never that I have seen, but if someone wants to dyno there jeep before and after adding a performance muffler I will gladly change my views. And if your mpg statement was right I would be getting 18 mpg, rather than the 11-12 mpg that I get now. The exhaust, intake, and injector mods have made my mpg's worse than ever, but its all worth it for the sound haha.

I didn't really chew you out, I was being nice about it. I try not to be much of a dick online. It's just people tend to believe everything that is advertised, and more times than not the estimates are extremely high because the vendor wants you to buy their product. I just didn't want to give you false hope when buying the product.

Haha it's all good.

94XjSport94

Sweet, i appreciate people on here who know their **** and who start sweet threads like this!!

UsmclovesXJ

Welcome man.

mr white

:facepalm:

UsmclovesXJ

I pulled that outa my *** sorry

94XjSport94

I got my new Flowmaster in today but i broke my clamp from the cat to the muffler, so is it alright for me to drive to the store to get a new one tonight or tomorrow? Just making sure the vibrations of the exhaust wont break anything else since i dont have the hangers on and the exhaust stops after the cat.

EastBeast

I just "upgraded" my stock exhaust setup. Mine necked down to 2.25" at the back of my rear cat. It got bad so I had to pipe through it while I waited for parts but anyways I replaced my rear cat with a high-flow 2.5" , swapped to a 2.5" muffler, and ran all the pipe in the back 2.5". My manifolds and main cats are stock, y pipe is stock. It sounds great! Power is great! WTH happened to my mpg is the question of the day though. I went from a combined average of 17.8 to 12.4 mpg. And no my foot isn't heavy. Well not for the last 3 tanks at any rate. It's my dd, goes about 65 miles round trip to work, 63 of it highway. Stock cherokee but for the exhaust and 235's. 177K, no codes or issues besides a few small leaks and needing a new front passenger ujoint. I just changed the oil sunday too. So idk. I've never had a vehicle react like this to an upgraded exhaust. I'm going to check my sensors and compression test tomorrow.