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Old 03-08-2015, 11:59 PM
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B.LaBrier's Avatar
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Location: New Florence, Missouri
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Help with some Headers

I'm looking at replacing the whole exhaust system on my 88 yj with a 4.0 head conversion. Right now its just kind of Frankenstein together, I found these pace setters on ebay and was wondering if anyone had any opinions of them

Pacesetter Header System 91 99 Jeep Wrangler YJ 4 0L 6 Cyl 70 1129 | eBay

I plan on tearing into the jeep later on to do a junkyard tbi on it so i want to go ahead and upgrade the exhaust while i'm at it. Appreciate any help.


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Old 03-09-2015, 01:51 AM   #2
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I used to work next door to one of their manufacturing facilities and knew a few guys that worked there. I got to take a tour of the place and they make some good quality stuff. On par with the turbine engine exhaust parts we made for aerospace applications. I was going to try out their header on my next rig but it came with a Doug Thorley unit already installed.

'91 YJ Sahara 4.0L/AX-15/NP231, D30/D35 @3.07
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Old 04-16-2015, 12:35 PM   #3
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The Thorleys are 14 ga 304 SS with 1/2" flanges ceramic coated on both sides. The Pacesetters are 16 ga mild steel with 3/8" flanges.
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Old 04-16-2015, 03:07 PM   #4
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I've had my Borla SS headers for about 15 years on my 4.0. It was the only engine mod that I could tell made a differance.

Whoops, I forgot putting in MSD wires, that made a noticeable differance too.
92 Jeep Renegade - 4.0, 5 speed with Borla headers, MSD wiring. Front Currie D44 with cromo and ARB, rear 8.8 with Yukon super 88 kit and ARB, 4.56 gears, 35x12.5 MTR Kevlar, 4.5 RE Extreme, Bilstien 5100, RuffStuff 1 ton over the knuckle steering, 9500 synthetic line winch, 52" LED light bar, GenRight skid plate.
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Old 04-17-2015, 05:39 PM   #5
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I have Banks SS headers and exhaust system. Heavy gauge stainless. After about 25,000 miles on them they still look and sound like new. Super tight welds and heavy duty flange.
Kinda pricey but worth every cent.
"It don't do no good to pump the brakes when you're upside down" A.J. Foyt

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Old 04-18-2015, 04:17 PM   #6
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I have the Thorleys on order and I am considering going with the Random Technologies pre-cats/Y-pipe
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Old 04-19-2015, 11:05 AM   #7
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I just put ceramic coat pacesetters on my 4cyl. a week ago. I can tell you they definitely make a difference in performance! The ones you are looking at are not the ceramic though, and will rust over time. You could hit them with very high temp paint to get more life out of them. I just put mine in, so I can't really comment on longevity, durability or cracking yet. But it looks like a good price to me. I can tell you the job was made easier with a car lift. You probably have to remove the motor mount, front Driveshaft and loosen the PS pump to get it in.
"NO! YOU CAN'T BORROW MY JEEP!" 91 YJ, 5.3 Vortec, AX15, Old Man EMU springs, one piece front passenger side axle shaft, 2.5"lift+1.5"BL,33"Tires,8.8axle,4.88 gears,SYE,Detroit TrueTrac locker, magnaflow muffler.
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Old 04-26-2015, 07:25 PM   #8
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I like my Pacesetters. 1995 yj 4cyl 226,000miles on orig motor trans and t-case. Made mine a little bit more peppy.
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Old 04-29-2015, 07:48 PM   #9
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that price seems like the normal price from morris 4x4 or any other online companies...

I just orderd a set of borla ceramic coated for my 4.2l I am hoping for some seriously noticable differences...

Im only getting 10mpg it runs ok... kinda weak... but, I really dont have much to compare it too... but, there is no passing many people on the freeway... hehehe

not that I ant to...

Im looking forward to it coming.. it's been almost a week now...

I also have a magna flo muffler ready to be installed...
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Old 04-29-2015, 08:20 PM   #10
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Looking at pacesetter as well. Amazon was a bit cheaper then eBay and has reviews. Some people complained it was hard to get a good seal
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Old 04-30-2015, 12:00 AM   #11
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ive been told to bring the header and the intake manifold to a machine shop to get the re-decked prior to installation...

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