• Welcome to H4O! For a reduced ad experience, please login or register with the forum.

I5 Catalytic Converters

rascole

Well-Known Member
Messages
2,527
Location
Bellflower, CA
Who has replaced the front and rear catalytic converters? What have you used? My exhaust just started to rattle and throwing a O2 code. With some advice I'm certain it is the rear. Not concerned with California compliant, will be registered in Texas soon.
 

alrock

El Diablo
Staff member
Messages
10,380
Location
Scottsdale
Someone removed my second cat in my 07 but it's not an issue for me since the 2nd cat is not monitored in 07s like it is in 06. So one solution might be to cut out the 2nd cat and relocate the rear O2 sensor and move it upstream. With that second cat out, I'm pretty sure I gained about 100 hp and 100 ft/lbs. Or maybe that was the stickers I added.
 

crwalkerasla

Well-Known Member
Messages
282
Location
Corinth, MS
My rear CAT was removed from my 06 prior to my purchase also. ran fin with idiot light on. PCM of NC said that they could turn it off with the tune.
 

rascole

Well-Known Member
Messages
2,527
Location
Bellflower, CA
I bought a replacement rear section including a cat from Amazon, I thought about just a cat replacement but the pipe has been abused over the years and for a cat and new pipe custom made was over $400, $250 on amazon was a steal.
Alrock, if you can send me the link for the stickers, I'm looking for cheap power.
 

Jeepwalker

Well-Known Member
Messages
806
Location
WI
There are a number of relatively inexpensive aftermarket H3 J-pipe's with Cats listed on Ebay. Or at least there used to be.

I haven't tried them and can't say from personal experience, but there've been a few on the forum over the years who have. Good luck!
 

rascole

Well-Known Member
Messages
2,527
Location
Bellflower, CA
Got the new rear cat, Walker Ultra EPA 54480. By comparison, the pipe alone should gain me 100hp. The stock 2.5" pipe is horribly pinched. For a few more $$$$ I'm sure a good shop could make a free flowing pipe. But, I need quick an simple.


20230808_173233 (1280x960).jpg20230808_173252 (1280x960).jpg20230808_173233 (1280x960).jpg20230808_173252 (1280x960).jpg20230808_173318 (960x1280).jpg20230808_175300 (960x1280).jpg20230808_175332 (1280x960).jpg20230808_175411 (960x1280).jpg20230808_175531 (960x1280).jpg
 

alrock

El Diablo
Staff member
Messages
10,380
Location
Scottsdale
Got the new rear cat, Walker Ultra EPA 54480. By comparison, the pipe alone should gain me 100hp. The stock 2.5" pipe is horribly pinched. For a few more $$$$ I'm sure a good shop could make a free flowing pipe. But, I need quick an simple.
Make sure to install the manufacturer's stickers in that box to unlock the full HP potential.
 

zebra

Well-Known Member
Messages
105
Location
cold & windy
shoot - i didn't think nobody still had a LT header for these. every time i'd looked for one, everybody was out of stock.
this colorado one fit right?
 

Ridinhigh1500

Active Member
Messages
27
Location
Raleigh, NC
shoot - i didn't think nobody still had a LT header for these. every time i'd looked for one, everybody was out of stock.
this colorado one fit right?
They are basically made to order from the place in California and the fitment is excellent. Since putting it on the throttle response is amazing and it sounds awesome too.
 
Top