Installed on a 1997 Jeep XJ Cherokee 4x4 with 4.0L engine and AW4 automatic transmission. They easily fit my head and fit perfectly. There were two "errors" during the installation. The first problem I had was installing the bolt behind the #4 main pipe (IIRC). I shortened it by 1/4" and had to use a combination wrench to tighten it. The second problem was figuring out where to route the extended O2 sensor wires. Using a 3/8" wire, I routed the fuel and brake lines from the engine bay and secured them with heat resistant wire ties through the line.The collectors themselves don't have high quality welds.They look like $200 exhaust manifolds, but with a little work and sandblasting they look nice.the possibility of to fully set these headers in place. I did not have to modify, bend, grind or cut the pipes or flanges in any way. One thing to be aware of is where and how you attach the Y-pipe to the headers. When using the clamps misalign you will HIT them with the front driveshaft You have been warned you can crack your new $200 productivity title set very quickly I recommend in there too en that you remove the black shipping paint from the headers prior to installation. I used chemical paint thinner and the shipping paint came off immediately. I sandblasted the manifolds and painted them with VHT "Flame Proof". They fit very well and sound fantastic in the cockpit!
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