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View Full Version : Looking for a Flexjoint/Flexpipe for my exhaust


winston856
09-15-2008, 06:19 PM
Hello guys, so here's the story.

Right now on my LGT I've got the borla replicas with the stock cat section, after the two cats is a custom catback that's 2.25 from the cats all the way back and connects to the muffler.

The "catback" part of the exhaust is basically one long straight pipe that connects to the muffler. The work is perfect but I was advised by a very good friend of mine that I need a flexjoint somewhere in there so my exhaust doesn't start cracking at the flanges down the road.

Now I thought this was a good idea and I've done some searching which I found out that a flexjoint is mostly preference. Well I would like one but I don't know where to buy them.

Now another part to this story is that I'm going to go catless. Since my cat section is less than the rest of my 2.25" catback it's a restriction. I would buy a high flow cat but don't have that much money. So catless is the way for now.

So I'll need a pipe to replace the cat section with two bungs in it for the O2 sensors. Ideally I'd like one with a flexjoint in it, that would be perfect.

Can anyone lend a hand and show me where I can get what I'm asking or if it even exists?
Grafton
09-15-2008, 06:25 PM
high flow cat from jeggs is $68...
Huffer
09-15-2008, 08:54 PM
A flex joint isn't actually needed... I suppose you could get one but to be honest the NA motors don't have a huge amount of exhaust flow...
winston856
09-15-2008, 10:36 PM
A flex joint isn't actually needed... I suppose you could get one but to be honest the NA motors don't have a huge amount of exhaust flow...

Well I thought it was more to allow the exhaust some cushion so it doesn't create leaks at the flanges eventually.
winston856
09-15-2008, 11:10 PM
Does anybody know of a good midpipe/cat replacement pipe that has the bungs already drilled into it, or should I just have the exhaust shop make me one?

It's got to have almost a 90 degree bend at the front to mate with the borla replicas I have on there.
Huffer
09-16-2008, 09:05 AM
If you searched around this board you'd find a couple of makes.
RandomTech is probably the most common.
track8
09-16-2008, 08:22 PM
The stock junction, the one with the sprung flange, is a flex. It may be negligable to need a flex section due to all the movement allowed by the hangers but since a Subie with AWD sees the engine torque on 2 different axis' it sure wouldn't hurt.

Enjoy: http://store.summitracing.com/egnsearch ... =%2D152589 (http://store.summitracing.com/egnsearch.asp?N=700+115+%2D152589&D=%2D152589)
Huffer
09-16-2008, 10:13 PM
It's not a flex pipe in the technical sense - it has a donut gasket and spring-loaded bolts...but the pipes themselves are still non-flex.

In fact, for about 30,000miles I've run an exhaust system without the spring bolts... :lol:
winston856
09-17-2008, 01:31 PM
Well I've found a place that sells them, the same manufacturer of my muffler, imagine that.

So I've got a choice of 4", 6", 8", or 10" flex joints. Does it matter what length I choose?

Does bigger = better in this case? Price diff is $9 from the 4" to the 10".
track8
09-17-2008, 06:23 PM
It's not a flex pipe in the technical sense - it has a donut gasket and spring-loaded bolts...but the pipes themselves are still non-flex.

In fact, for about 30,000miles I've run an exhaust system without the spring bolts... :lol:True it isn't really a flex, it probably almost never moves, in fact, my previous 'roo was rolling spring free for the 2 years that I had it, and my friend is still rocking it that way with no apparent trouble.

To the OP, since it seems that a flex is deemed optional, I'd say get the shortest one if you still opt to run one.
winston856
09-18-2008, 08:51 PM
Picked up the 4", thanks guys. :)