Lg4 2 1/2 cat back to stock 2 1/4 cat?
05-11-2012, 08:47 AM
#1
Member
Thread Starter
Join Date: May 2012
Posts: 120
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 t/a
Engine: Lg4 305 carb
Transmission: 700r4 auto
Axle/Gears: 2.73 posi
Lg4 2 1/2 cat back to stock 2 1/4 cat?
New here,
I have a 86 factory stock trans am lg4 5.0 700r4.
Iv read all the upgrade posts cams, headers back, gears, duel snorkel air.
My question is. I have a dynomax super turbo 2 1/2" cat back system
I need to connect it to factory 2 1/4 cat. How do I do it? What adaptors if any?
I am new to building up a car "mechanics for dumbies" was printed just for me!!!
Thank you for any help. I do know that car has ALL its emissions stuff..
I have a 86 factory stock trans am lg4 5.0 700r4.
Iv read all the upgrade posts cams, headers back, gears, duel snorkel air.
My question is. I have a dynomax super turbo 2 1/2" cat back system
I need to connect it to factory 2 1/4 cat. How do I do it? What adaptors if any?
I am new to building up a car "mechanics for dumbies" was printed just for me!!!
Thank you for any help. I do know that car has ALL its emissions stuff..
05-11-2012, 10:30 AM
#2
Senior Member
Join Date: Jun 2009
Location: Evansville, IN
Posts: 511
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1983 Z28
Engine: Forged 355
Transmission: 700r4
Axle/Gears: 2.73
Re: Lg4 2 1/2 cat back to stock 2 1/4 cat?
First, Welcome to the site! There is a ton of information here, read up!
What state do you live in? I would ditch the cat, your local auto part store will have a pipe that will replace the cat, and several adapters.
What state do you live in? I would ditch the cat, your local auto part store will have a pipe that will replace the cat, and several adapters.
05-11-2012, 08:55 PM
#3
Member
Thread Starter
Join Date: May 2012
Posts: 120
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 t/a
Engine: Lg4 305 carb
Transmission: 700r4 auto
Axle/Gears: 2.73 posi
Re: Lg4 2 1/2 cat back to stock 2 1/4 cat?
I would but what about the little pipe that comes off of it?? I don't want lights on or anything!
05-11-2012, 09:37 PM
#4
Junior Member
iTrader: (1)
Join Date: Jun 2005
Location: South Dakota
Posts: 84
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 Trans AM
Engine: 305 TPI
Transmission: T-5
Axle/Gears: 3.42
Re: Lg4 2 1/2 cat back to stock 2 1/4 cat?
The little pipe connects to the smog pump. All a smog pump does is inject fresh air into the cat and exhaust manifolds to try to lower emissions. By removing the cat and smog systems, you will not set a check engine light. There are no engine sensors past the cat on these cars. If you state doesn't have emissions testing, I would just chop the cat off.
05-12-2012, 09:32 PM
#5
Member
Thread Starter
Join Date: May 2012
Posts: 120
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 t/a
Engine: Lg4 305 carb
Transmission: 700r4 auto
Axle/Gears: 2.73 posi
Re: Lg4 2 1/2 cat back to stock 2 1/4 cat?
No emissions, if I cut off cat it looks like to much of a bend in the pipe to get adaptor to seal right. Yes I'm clamping cant weld and can't afford to have it done.
Anyone have a picture of cat removed with a clamp??
Thanks guys
Anyone have a picture of cat removed with a clamp??
Thanks guys
Thread
Thread Starter
Forum
Replies
Last Post
