good luck with the combo of K&N filter, cat back exhaust by local shop with Turbo muffler and straight out tail pipe of and of course with the 5:13 gears and 35's with a 6 speed, I can almost take a ricer.

 

Yep, very limited in what you can do. As OBX pointed out, a major issue is the Y pipe and secondarily the throttle body. I would think at some point some brave soul will have a Borla long tube installation with added cats and I'd also suspect someone like Hesco will introduce a replacement throttle body. Both of those things are going to require some intervention on the PCM side, such as a throttle body relearn as Superchips has on other platforms, and likely an actual tuner to cope with the long tubes.

Myself, I've already resigned myself to the fact that I will be purchasing a Pentastar equipped JK as soon as one becomes available and for the foreseeable future a performance mod that comes for the 3.8 JK motor will need to be as much of a no brainer as the Flashpaq was.

 

Superchips will never have full tuning capabilities. Their isn't a demand for it. Plus the fact that their are too many idiots who will blow up their engines because they don't know what they're doing, and then get mad at Superchips.


My next mod will be a test pipe, no cats

 

Avoid a duel 2.5" exit system (i.e. gibson). It will be loud but you will feel it having to rev harder to get going.

 

deleting cats is not illegal everywhere. i have done tests and have quantifiable data that shows real gains with a flowmaster 40 over other mufflers. if it's about sound, go with something else.

 

The reason Superchips won't having tuning capabilities is because their parent company has placed CARB requirements on them.

As far as blowing stuff up, when some transmission stuff becomes available as on other platforms and because it doesn't have emissions issues, there will be plenty of shiznit blowd up.

 

I installed the MBRP cat back about a month ago on my 2dr 6 spd. The dyno sheet looks good, but I wish I could have dyno'd before and after myself. Since they are one of the few companies that actually publishes an application specific dyno sheet I felt OK about it, definitely don't believe the exhausts with the "up to 30 horsepower" claims... garbage, probably more in line with the MBRP gains.

The torque/power improvement is not noticeable on my butt dyno. It may be a bit more snappier but that might be psychological. Gas mileage bumped up 1.5-2 mpg on highway long hauls ... no improvement noted on the around town gas mileage.

Sound wise it growls and gurgles when idling and crawling. It can be loud when you boot it but it's quiet around the neighborhood when you are easy on the gas. Seems a little buzzy at times ... not high toned buzz like a 4 cylinder, but also doesn't sound anything like a decent 6 cylinder or 8 cylinder. Think mid-range.

I like it ... if I did it again I'd probably go with muffler relocating version.

-matt

 

Without going and crawling under my Jeep right now (it's 100 degrees outside and I'm pretty sure I don't want to lay on the driveway), I'll ask this question: There's nothing between the factory cat and the muffler but pipe, right? If so, you're saying that aftermarket pipe is going to give me considerably more flow/velocity than the stock pipe?

I could totally be missing something, though. Anyway, thanks all you guys for your input. I think I'll stop into a few muffler shops as I'm out and about to talk about options. I don't have any real knowledge of where the MBRP kit relocates everything to, so if you were me walking into a muffler shop and asking about relocation, what would you tell them you want specifically?

 

The reference was to the Y pipe which includes the cats. The thing does suck ass, is way expensive if you damage it and an easy target for a performance boost if you think you can master the PCM.

 

i have a full flowmaster cat back and its really all sound u will get like 1more hp and i noticed a little better mpg.