Cutlass Supreme Exhaust System Questions

[olds307 and 403]

http://pypesexhaust.com/i-12200762-68-72-olds-442-2-5-downpipes-2-bolt-dof10s.html
These work with factory Olds manifolds but they have to be the pre catalytic converter manifold's, the changed the outlet angle and a 3 bolt flange on the passenger side. Sanderson shorties fit quite well on the Olds 260 through 403 but need custom down pipes.

 

[rogue_ryder]

I ordered up my shorties today. I got a set from Thornton Muscle cars for Gbody olds that look nice and are supposed to fit like the factory manifolds. I've got a good exhaust shop locally and if the Pypes DPs don't bolt up exactly to the manifolds I'll have them modify it to fit. Cut and Welding flanges is no big deal.

I'll post up a pic of the atrocious install that was done with the long tubes after I pull them.

 

[Jeff Blagden]

Dylan I just noticed you are also from Manitoba where about are you would love to see your car in the summer Jeff

 

[DoubleV]

I ordered up my shorties today. I got a set from Thornton Muscle cars for Gbody olds that look nice and are supposed to fit like the factory manifolds.

What did you buy exactly?

 

[foxtrot]

What did you buy exactly?

350jr's???

 

[81cutlass]

Late to the party but yeah, I bought the pypes 3" system for my grand prix which only comes in rear bumper exit. Bumper exit works for A bodies where the quarters go below the frame more and F bodies where the rear rises up but the way the rear of a G body is I feel the rear exits kinda ruin the view. Seeing 2ft of pipe run down the side is kinda blah.

Plus you can't run a trailer hitch and it adds like 8lbs of pipe to go to bumper exit.

I cut the bend of my pipe right where it makes the turn to go toward the rear bumper and flipped the pipe 180 degrees. From there I took a 35 ish degree cut to match the slope of the quarter.

 

[rogue_ryder]

What did you buy exactly?

Thornton Muscle Car shorty headers; those guys are know for producing quality W30 style manifolds. I also bought the Pypes Downpipes as well with the 2 bolt flange (If it's not a perfect fit; it shouldn't be an issue to modify).

 

[DoubleV]

I never saw those headers before. Didn't know they made em. What's the tube size?

 

[rogue_ryder]

I never saw those headers before. Didn't know they made em. What's the tube size?

1 5/8” Primary tubes

 

[olds307 and 403]

1 5/8” Primary tubes

What motor is in your 442? I assume a 350. Thornton doesn't even have them on their site yet. They currently have tubular W30 manifolds which Olds people are really split on. This thread just came up on Classic Olds, the shorties look nice, I heard they were in development but assumed they were making 260-403 tubular manifolds.
https://classicoldsmobile.com/forum...-70-cutlass-dual-exhaust-pipes-suppliers.html