Wanna remove cat

670 Views 7 Replies 5 Participants Last post by Grannynational, Oct 3, 2002

smokin62

Discussion Starter · Sep 25, 2002

i think my car runs slower with the cat on than when it had the test pipe on. Wanna run the Test pipe on the street again. Well after I get my next emissions test I'm planning to put the test pipe on. Did you ever remove the cat by yourself in the garage with just the front end up on stands?

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87 GN Hardtop~Stock motor, Mease stock intercooler w/Duttweiler big neck,stock intake, stock tb and plenum, TE51 w/.63 housing, stock D5, MSD 50's, THDP, ATR 3" dual exhaust, big mouth cold air inducition, SMC alchy injection and egt gauge, MM boost command, PTE remote oiling system, Walboro 340 hotwired, 10 mm Magnecor wires, AC R43 plugs @.035 Adjustable regulator, ATR 3" maf pipe, B&M tranny cooler, Deep aluminum tranny pan, Dynotech shift kit, scanmaster 2.1, factory alarm, 21* Testa alchy chip, dual airbags, vdo gauges, autometer boost gauge, front braces and rear seat brace, Bilstein shocks, more mods to come

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salvageV6

· #2 · Sep 25, 2002

Yeah if it hasn't been on too long you can do it.

Always use neverseize on the bolts and studs too.

You may have to loosen the THDP to gain enough room.

You may need a BFH if you used a crush clamp on the cat. conv. to THDP.

Depends on the install and corrosion you may need a torch on the cat. studs to loosen them.

A fun job for sure.

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motorhead

· #3 · Sep 25, 2002

Hee hee... I changed my cat out for an open dump last night in under 10mins.

Open dumps sound great!

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Michael Lis

87 Vortec SS -- 12.7 @ 110 w/ 1.9 60' (This car runs 12s on 87 octane)
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87 Turbo T - 1986.99 WE4 Clone -- 13.7 @ 104mph w/2.2 60'
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Originally posted by myclone
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Grannynational

· #4 · Sep 25, 2002

I used stainless hardware for the quickchange cat also

Joe

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1986 Buick Grand National
TA-49, 009's, Hooker cat back, CAS V4, Art Carr 3000 stall, THDP and all the other usual stuff.
[email protected]

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granitestategn

· #5 · Oct 1, 2002

If the cat is stuck on the pipe, you can use a die grinder with a cutter wheel to cut through the outer pipe (not the inner pipe) lengthwise at the clamp area to allow it to expand some. Don't get carried away with it and you may not even have to weld it back up to keep it from leaking. Worked for me!

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Grannynational

· #6 · Oct 2, 2002

get some sort of torch and head up the the pipe, it will expand and slide right off. Even a small propane torch will work from your local hardware store.

Joe

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1986 Buick Grand National
TA-49, 009's, Hooker cat back, CAS V4, Art Carr 3000 stall, THDP and all the other usual stuff.
[email protected]

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smokin62

Discussion Starter · #7 · Oct 3, 2002

Is it a good idea to remove the THDP and move it forward a little to get the cat out? I don't want to have to remove/loosen the exhaust hanger to get the cat out

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Grannynational

· #8 · Oct 3, 2002

Yes.

Joe

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1986 Buick Grand National
TA-49, 009's, Hooker cat back, CAS V4, Art Carr 3000 stall, THDP and all the other usual stuff.
[email protected]

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