Stroker exhaust header change

[Viperbaron]

2001 Wrangler, pulling the motor to rebuild into a Stroker. The factory exhaust uses a dual collector port configuration, into 2 small cats, then into a single cat and finally in to the muffler. Dual port headers are cost prohibitive as compared to a single collector type header. Can the less expensive, single collector header be used on a 2001 if I replace the rest of the exhaust tubing? There are 2 O2 sensors that are required for the emissions (check engine light) catalytic efficiency fault code.
Using a local muffler shop to bend/build the tubing, would it buy me anything to increase the exhaust tube size from 2.5 inches to 3 inches?
I'll be using Russ Pottenger to do the stroker head work. Larger LS valves, ported head & intake, bigger cam.
Thanks all.

 

[Chris]

The best header you can buy for your stroker is this one, hands down:

https://americanracingheaders.com/collections/tj-jeep/products/jeep-1998-2006-tj-4-0l-long-system
That header alone with proper tuning will yield you 20-30 RWHP, Golan can vouch for this.

Make no mistake, those headers cost a lot, but they are the real deal. You WILL NOT find a better header for the TJ, period. Golan uses those headers on all their high power 4.6 strokers.

In addition, if you disable the post-cat O2 sensors via HPTuners, you can get the catless version of the header, then you don't have to run cats.

Of course this only works if you're in a county without emission testing like I am.

 

[toximus]

The best header you can buy for your stroker is this one, hands down:

https://americanracingheaders.com/collections/tj-jeep/products/jeep-1998-2006-tj-4-0l-long-system
That header alone with proper tuning will yield you 20-30 RWHP, Golan can vouch for this.

Make no mistake, those headers cost a lot, but they are the real deal. You WILL NOT find a better header for the TJ, period. Golan uses those headers on all their high power 4.6 strokers.

In addition, if you disable the post-cat O2 sensors via HPTuners, you can get the catless version of the header, then you don't have to run cats.

Of course this only works if you're in a county without emission testing like I am.

Every time you post that link up I want to make that kit fit into my build. If I'm ever over by NY I may ask them if they'll do the install for me and make any changes needed for it to fit.

 

[Chris]

Every time you post that link up I want to make that kit fit into my build. If I'm ever over by NY I may ask them if they'll do the install for me and make any changes needed for it to fit.

Trust me, you need to! With that supercharger you'll pickup an honest to goodness 20-30 more HP with a tune.

I've talked to those guys in depth (as well as Golan), and this header is the missing link for the 4.0. My next TJ will have this header even if it's naturally aspirated.

I'm guessing they would likely do the install for you. I know that Nick from ARH had been wanting a TJ in the shop to test fitment and other things.

Can't remember who it was, but someone on the forum bought that header and was pretty blown away by how much of a difference it made in terms of power.

 

[BAPilot2]

I wonder...
Is there anyway to run that header/exhaust system, with cats, and get O2 bung mounts installed in order to use the OEM/factory O2 sensors?

Here in the DFW area of Texas my Jeep must pass emission testing annually in order to be licensed.