Contour Enthusiasts Group Archives Forums Modifications Duratec Performance gutting precats TODAY!!!

hi all. its been a while since i have posted but i've been too busy working at the machine shop. i have looked and i couldn't find a how to or anything describing how to gut the bank2 precat... do u just gut it from the top thru the inlets or do u go around the bend somehow. i will also be adding a glasspack in place of my resonator.

also will it effect the computer if i don't install mil eliminators. i bought my car at a used dealer auction and after all my work on it (rebuilding it) i found that the CEL has been removed . this does not bother be because i have a Matco DEterminator scan tool. so i always no what is going wrong w/ the car

thanx

Drill a 1/2 hole right after the 90* elbow on the bottom of the exhaust manifold so youu can get a tool in there to gut the pre-cat. Weld in a patch when you're done. You'll want MIL's for sure.

i just did mine and a friends a few months ago and its not hard at all. like swazo said, cut that 1/2" hole and what i did was i got piece of thick welding rod and bent it and just knocked it around for about an hour to get it all out. i dont know about welding a patch onto that surface but i just got a short bolt that fit the hole, tapped it and locktite and that beatch hasnt moved. oh and make sure to enjoy the sound your sh*t makes when the pipes are off

Like this?

Before


After

yea so things got a little more involved because i am also replacing a leaky manifold gskt on bank 1... yea it sux i would love to do it with out pulling the alternator and the half shaft.... again.

but im doing my best to get'er done.

oh but on a better note when the car gets rolling again i will ahve the use of my 2ndaries back. (cable cut by waterpump pulley)

oh and i dind't buy another one, i took the old one apart, w/out breaking it, and made a custom brace to cover one of the gear shafts where the screw heads had broken off, then i replace the cable w/ a bike brake cable for $5.

can't wait to get back in the car, have power above 5000rpm, and a good sound, w/ no more clogged cat

u guys think the ride would be too loud if i gutted all 3 cats and replaced the resonator w/a glasspack?
already have a turbo II muffler so that and the 'pack would be the only things quieting the exhaust down.

also im trying to hollow out the ypipe at the collector anyone have any ideas?
i have access to a welder, cutting torch, plasma cutter, and a porting tool for the job.

also is it really worth it to do that? the thing looks so cluster funked in there it just can't be good for exhaust flow.

i know i could prbbly do a search but its more fun to ask and get ppl pissed off for posting a topic that has already been covered eleventybillion times

Are you guys gutting the pre-cats while still installed on the car? I really want to do mine but can't imagine moving the EM's from the car and have heard of the dangers of NOT removing the EMs.

wow so it can be gutted while the manifolds are still on that is great that will save me a lot of time when it comes time for me to do mine. im not going to do it till my warranty runs out.