1985 Buick Regal T-Type Exhaust Replacement

lewisd

New Member
IMG_3921.jpg
IMG_3923.jpg

Rear of Cat.jpg
Front of Cat.jpg

Good Evening all - I need some help with an Exhaust system replacement. I purchased the Pypes Performance SGG50R (2 1/2" Pipe) exhaust system knowing that it had a 4 bolt flange on the front of the Y Pipe and my OLD Catalytic converter had a 2 bolt flange. Tried like crazy to get a Test Pipe but couldn't find one. I was told by someone that the Monte Carlo SS Cat had a 4 Bolt Flange Front & Rear so I purchased one. When I set them side by side, the Monte Carlo Cat was approximately 4" shorter than the existing Catalytic Converter which had me wondering if the Pypes Exhaust Systems Y Pipe would be too Short. Please see the pictures I've attached. Does anyone know where I can find a discounted Pypes Performance Cat Delete Test Pipe? I think the part number is PVC10. I've tried everywhere. Thanks for your help! Stay Safe!
 

1986 Buick GX1

GX1 #001 [The One and Only]
Does the cat have the proper flanges on both ends, just too short?

I think I would hang the Pypes exhaust, measure from the 4 bolt flange to your downpipe and make the cat the same length by adding some 409 SS pipe. MIG weld with 308 SS wire for rust free longevity.

What size is the Pypes downpipe?
 

lewisd

New Member
Does the cat have the proper flanges on both ends, just too short?

I think I would hang the Pypes exhaust, measure from the 4 bolt flange to your downpipe and make the cat the same length by adding some 409 SS pipe. MIG weld with 308 SS wire for rust free longevity.

What size is the Pypes downpipe?

The New Cat appears to have the proper flanges at each end. All of the exhaust pipes are 2.5 inches in diameter. I was thinking it might be easier to add 4 inch pipe extensions to the back end of the Y-Pipe (Mid pipe) if moving the Y-Pipe forward doesn't change where the pipes cross over the rear of the transmission or drive shaft. Without new 4 inch flanges its impossible to make a spacer to connect the downpipe to the front of the catalytic converter. Thoughts???
 

1986 Buick GX1

GX1 #001 [The One and Only]
The New Cat appears to have the proper flanges at each end. All of the exhaust pipes are 2.5 inches in diameter. I was thinking it might be easier to add 4 inch pipe extensions to the back end of the Y-Pipe (Mid pipe) if moving the Y-Pipe forward doesn't change where the pipes cross over the rear of the transmission or drive shaft. Without new 4 inch flanges its impossible to make a spacer to connect the downpipe to the front of the catalytic converter. Thoughts???

My thought was to cut the cat and add the section in.

Are you wanting to have a cat and a test pipe?
 

lewisd

New Member
Well - If I have to install a Cat I want to do it in the least difficult way. If I could buy the test Pipe - I'd remove the Cat completely because the car is registered on historic plates and isn't subject to inspection in NJ
 

1986 Buick GX1

GX1 #001 [The One and Only]
Well - If I have to install a Cat I want to do it in the least difficult way. If I could buy the test Pipe - I'd remove the Cat completely because the car is registered on historic plates and isn't subject to inspection in NJ

PM sent.
 

1986 Buick GX1

GX1 #001 [The One and Only]
Thread update:
I wanted to post this for other members since the site troubles.

lewisd and I, along with help from other board members came up with a solution for adapting the ‘86-87 exhaust on the ‘84-85 hot air cars.

lewisd is the draftsman and I am the craftsman. Lol

The drawing
136ED45B-C970-4E08-887B-BF219F21563A.jpeg


The adapter test pipe.
FFA3CA61-2178-4343-8490-C5747F8349FD.jpeg


Installed
277468F0-8EB0-47A6-869B-47AD9A88E05F.jpeg


Photos courtesy of lewisd and myself.
 

turbobooster

Active Member
I live in california and I did something similar to hotairwh1 I reworked my cat and dump pipe to fit the exhaust flanges in the car so I can swap out as needed for smog , if u weld your good , or find a welder and do your custom work , or pay extra to have them do what u need
 
Top