New cats
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,631
Not that hard, but a day before you go to do the swaps, spray all the bolts from the end of the exhaust manifolds to cats, and after cats to start of X pipe with penitrating oil, and let is sit for a day not driving the car. You may luck out and this saves the bolt, but may not and have a few snap and need to be replaced instead.
So step one is to remove the pre O2 senors to start with, then get under the car to unbolt the bottom of cat pipe from the X pipe, the unbolt the car to exhaust manifold up top to drop the cat's out one at a time. To reinstall, pretty much just the reverse, but get all the bolts started before you go to tighten them back up.
And be very sure that the problem is the cats are defected to start with, since they are not going to be cheap in the first place.
So step one is to remove the pre O2 senors to start with, then get under the car to unbolt the bottom of cat pipe from the X pipe, the unbolt the car to exhaust manifold up top to drop the cat's out one at a time. To reinstall, pretty much just the reverse, but get all the bolts started before you go to tighten them back up.
And be very sure that the problem is the cats are defected to start with, since they are not going to be cheap in the first place.
Team Owner
Joined: May 2000
Posts: 53,804
Likes: 5,632
From: Plantation Florida USAF(Retired) 1966-1990
U.S. Air Force
St. Jude Donor '05 thru '26
NCM Sinkhole Donor
I had mine replaced on my 05 due to right being clogged.
Make sure you have right socket for 02 sensors they have a special socket made just for that project.
After I replaced it they stink for about thousand mile till they stopped.
Make sure you have right socket for 02 sensors they have a special socket made just for that project.
After I replaced it they stink for about thousand mile till they stopped.
Burning Brakes
Joined: Jun 2015
Posts: 1,192
Likes: 319
From: Shelbyville Kentucky
I've had my cats on and off umpteen times fooling with some poorly fitting shorty headers. Absolutely drown the bolts with BP Blaster and let soak a day or so. The first time it will be a pain but it's not really that bad.
