So on my trail rig, I'm running a true straight pipe with a glasspack. When its hot out, I get a sputtering issue that comes and goes for 5-10 mins. But when its cold out, there's not a single issue. I've been straightpiped since December, with no issue. Then we had a hot week of in the 80s for the first time this year, and I had the issue the whole week, then the next week went cold, nothing. I was out on the trails last weekend, morning was cold, nothing. Lunch the sun came out, got hot, had the issue. Then the sun went away and the issue stopped.

Could this be a back pressure issue? I posted this issue in another section before I thought of the exhaust, and the guys there say its tune up related and such, and I agree with them, since it's overdue for a tuneup, but I would think if it was tuneup related, the issue would be happening constantly, regardless of weather.


Cheers

 

Not a backpressure issue.
I wouldn't nessarly blame this on your exhaust either. Maybe the xj's getting to hot. Or a bad o2 sensor thats bugging out when hot.

 

Well I do have a fan I turn on when I'm driving around, but I've been using that since I got the XJ a year ago. I'll be installing hood vents soon too though. The o2 sensor is another consideration. I'm just thoroughly confused with this, since it only happens when its hot, so its obviously heat related, but it just started happening.


Thanks

 

Could be many things but id look at your o2's when you do your tune up

 

Thanks. And on a semi-related note, lol. I'm looking at the Flowmaster 44. I've heard nothing but great things about it. I take it I'm making a good decision?

 

Very good decision. It's really deep sounding. My only complaint is that in the really high rpms, 3000+, it sounds a bit ricer. I think a nice big tip out the back would help. But other than that, it sounds awesome.

 

I have no doubt it'll sound better than a straight piped glasspack, that sounds like a lawnmower unless you floor it lol.

 

Lol had a 44 I took it off and now im straight piped and it should like I like. But yes 44 good dissision

 

No, VWs sound like lawn mowers! My jeep is straight piped with a cat, 2.5" pipe, and a 4"x18" tip. It sounds awesome when the idle drops to 600-700rpm. Bropbropbropbropbropbropbropbropbrop LOVE IT!

 

It sounded great when my muffler fell off, then later that day somewhere my cat did as well, lol. I needed to muffle the noise so I picked up a glasspack. Only sounds nice when flooring it. lol

 

Just installed a 2.5" catback inch exhaust with flowmaster 40 series muffler. Now i want to move onto the downpipe and header. I know which header I want to use but where can I get a good fitting 2.5" downpipe?

 

Spintech 9000 is in with a 2.5" mandrel bent pipe and it sounds mean!! I've got a video but it's not that great, there's background noise.

 

My Series 40:

 

Just got a flowmaster 40 series on my 93 xj and love it!!!

 

i just got a flow master and im think about running it out the side. does anyone know of any problems or how it sounds with it out the side.