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Corbet
04-15-2009, 09:25 AM
Well after a few band aids I think the exhaust on the FZJ80 is done. This morning the inlet tube on the muffler poped out again. I had it welded once already after last years run up to Wheeler Lake.

So I'm sitting here at work without a computer to search here or MUD. What's the concensus on 3" without forced induction?

thelal
04-15-2009, 11:53 AM
My crashed 96 just got sold at Klode's (I was outbid)
If I can contact the buyer I'll pass along your way
as that truck had a brand new exhaust (incl new cats) put on just the week before it got totalled

brendan.lally@mail.com
720 652-0467

Corbet
04-15-2009, 12:23 PM
My crashed 96 just got sold at Klode's (I was outbid)
If I can contact the buyer I'll pass along your way
as that truck had a brand new exhaust (incl new cats) put on just the week before it got totalled

brendan.lally@mail.com
720 652-0467

Thanks but I'm in Durango and need to get it fixed quickly.

Hants
04-15-2009, 12:47 PM
I have no hands on experience, but I've done some research. Here's what I've gathered:

3" is great for forced induction
2.5" is the max for normally aspirated

There are more recent cats available that will allow you to go to just 1, and then run up over the frame rail to improve clearance. Mud has the make & model numbers.

Tch2fly
04-15-2009, 12:50 PM
Well after a few band aids I think the exhaust on the FZJ80 is done. This morning the inlet tube on the muffler poped out again. I had it welded once already after last years run up to Wheeler Lake.

So I'm sitting here at work without a computer to search here or MUD. What's the concensus on 3" without forced induction?

Good exhaust systems are a science, lot's of misconceptions out there

In my case I was looking to get rid of the resonator (and it's "whooshing") and get a bit more clearance under the muffler. I felt like 3" was too big so I went 2 1/2 with a 24" magnaflow and I've been happy with the sound (really can't say that if affected performace one way or the other)

Don't think 3" would be a problem other than the tight fit. Good luck:thumb:

Corbet
04-15-2009, 01:08 PM
OK got a 3pm appointment at the local muffler shop. But a couple of things.

#1 Muffler guy is telling me I could have a CA emmisions specific vehicle? I have never heard of this with an 80. Thought all were 50 state legal meaning there were never 80's built specific to that market. Please confirm.

#2. I'd like to go forced induction someday so not having to redo this down the road would be nice. So 3" or 2.5".

#3. Hants please post a link to that part number thread on MUD if you have it.

powderpig
04-16-2009, 07:00 AM
I saw the sticker from you truck on Mud. I know in Cal they have to replace with a stock convertor. Worst case is if you have issues, just call up Oleg or find a 97 48 state computer and all is well then. Sensor and such do not change, but the computer does. Just more cost added to the equation.
I do not think you will have a problem. But the gentle man that does the exhaust, has he had problem before? or just just heard about problems with Cali truck or Cali cruisers in a specific way?

Corbet
04-16-2009, 08:03 AM
he has had problems before, but with other makes and models. He has not replaced a CA FZJ80 cat system yet.

Has anyone seen or done the exhaust up and over the frame without cat replacement on a OBDII truck? I've searched MUD without any luck.

Hants
04-16-2009, 11:24 AM
Here's a newer thread that covers it...

http://forum.ih8mud.com/80-series-tech/261410-over-frame-mandrel-bend-exhaust.html

Hants
04-16-2009, 11:31 AM
Here's another (covers 3" mostly, but good info for 2.5" too):

http://forum.ih8mud.com/80-series-tech/252531-3-exhaust-upgrade.html

Edit: This thread is ST infected... first 2/3 is good. After-that, might as well tune it out.

Corbet
04-16-2009, 03:55 PM
Hants thanks for the links I had read one of those the other night.

Still trying to determine if anyone has got the pipe up and over the frame after the OEM inline cats. This is what I'd like to do in an interest in cost.

Hants
04-16-2009, 04:48 PM
All of the ones I have read about substitute a modern single cat for the two, then they have room to go up and over the frame.