The Cat Is Commin Off! need sizes tho...

[OneFastBaron]

im almost 1000% sure thats what is killin me up top. so its commin off tonight. i just need to know how big the inlet on the cat is to get a "test pipe" for it. i know the outlet it 1.75. thanks guys.

[89daytonaTII]

inlet is 2.25" and the outlet is 2.25", it doesn't go down to 1 7/8" till over the axle

[OneFastBaron]

Quote:

Originally posted by 89daytonaTII inlet is 2.25" and the outlet is 2.25", it doesn't go down to 1 7/8" till over the axle

thanks alot man! i dont know why tho. but according to the discount auto store computer it says 1.75 at the end of the cat

[OneFastBaron]

Quote:

Originally posted by 89daytonaTII inlet is 2.25" and the outlet is 2.25", it doesn't go down to 1 7/8" till over the axle

by anychance will a 2.5in pipe work? no one seems to carry 2.25 and i cant get thru to autozone *** i hate autozone

[89daytonaTII]

if you have 2.25-2.5 flanges on either sides of the 2.5 pipe then it will work, but if not there's too big of a size difference

[crazymadbastard]

How about if you just "hollow out" the cat. I have seen people take pipes to smash the stuff out.

[lametec]

Inlet on the cat is 2.5". Outlet is 2.25".

I used a 2.5" pipe (18") from Autozone with a swaged end on one side. This end I clamped to the downpipe. On the other side, I believe I used a 2.5" -> 2.25" adapter, clamping the adapter on the outside of the stock exhaust pipe.

This was some years ago, so I'm a little iffy in the adapter size. Worked great, though.

[OneFastBaron]

Quote:

Originally posted by lametec Inlet on the cat is 2.5". Outlet is 2.25". I used a 2.5" pipe (18") from Autozone with a swaged end on one side. This end I clamped to the downpipe. On the other side, I believe I used a 2.5" -> 2.25" adapter, clamping the adapter on the outside of the stock exhaust pipe. This was some years ago, so I'm a little iffy in the adapter size. Worked great, though.

i think they changed it to 2.25in. inlet. for 88. i know the outlet is 2.25in. of course no one carry's 2.25in pipes

heh i found out another reason why my car was really slow up top... i blew some vac lines off LOL zip ties own me!!!! now to check the cam and ignition timing

[OneFastBaron]

one last question! is the pipe gonna be dragin when i cut it? i wanna run open downpipe for a while. is the rest of the stock exhaust gonna just dangle.... any way i can string it up ghetto stylin?

[crazymadbastard]

If you gonna do that just remove the whole system past the DP.

[89daytonaTII]

yes the DP will hang too low once it's cut off before the cat and nothing is hooke dup to it. I used and still am using some 16guage wire (solid not coiled) and have strung it up from the heat shield "bolts" the DP is light enough that it won't be a problem.

[OneFastBaron]

Quote:

Originally posted by 89daytonaTII yes the DP will hang too low once it's cut off before the cat and nothing is hooke dup to it. I used and still am using some 16guage wire (solid not coiled) and have strung it up from the heat shield "bolts" the DP is light enough that it won't be a problem.

dont you mean behind the downpipe? i was thinking of just doing the same as you said... get some wire and string it up... coat hanger maybe

and crazymadbastard i said running an open down pipe for a while. not for very long.

[89daytonaTII]

behind the DP, before the cat. same place

[lametec]

Quote:

Originally posted by OneFastBaron i think they changed it to 2.25in. inlet. for 88. i know the outlet is 2.25in. of course no one carry's 2.25in pipes

Nope. Inlet was always 2.5". My Lancer which I did this to was an '88.

Grab a 2.5" pipe like I said.

[89daytonaTII]

Quote:

Originally posted by lametec Nope. Inlet was always 2.5". My Lancer which I did this to was an '88. Grab a 2.5" pipe like I said.

so the 2.25" DP flanges to 2.5" for the cat. hmm learn something new everyday. I use to have an 88 but never modified it one bit so i didn't notice.