[supraz]

Yes,

That is a Doug Thorley for sure.

Dale

 

[supraz]

I realize that you won't need it in Montreal, but for those in California, this is the CARB EO Exemption that relates to the Doug Thorley header.
This was posted here by another member, but I can't remember who, or where is was.

Dale

 

[supraz]

Nice surface coating Dale!
Is it yours?
If so, does it still look that shiney?

Jocelyn,

As a matter of fact, it is my header and it DOES still look that shiny.
I bought the thing new in the '90s, had it ceramic coated, and promptly didn't install it.
I bought a Tri-Mil header around the same time and could not make up my mind as to which one I wanted to use.
So I waffled and did nothing....

The Thorley is WAY better built than the Tri-Mil. The metal is heavier gauge, the tube lengths are more equal, the primary and collector flanges have more clearance.
Truth is, I'm too old to really appreciate a header. The sound will be significantly louder so I'm in no hurry to install it. But it is nice and shiny so I will have to install it on my 1983 on general principle.

My wife's 84 is an automatic so it could use some more power. I will have to prep the Tri-Mil for it to make it a little more peppy to drive. It will need to be modified like George did with the Raptor Racing Tri-Mil, shortening the O2 sensor mount, rotating the collector flange for more clearance and so on.

Decisions, decisions.

Dale

 

[supraz]

@supraz do you know if this header is drop-in ? Or is there any changes required to make it fit an OEM type exhaust line with the OEM cat ?

About the only thing that can be an issue is the header flange runs interference with the power steering pump mount.
One has to either relieve the header flange or the mount.
If you are coating the header, you REALLY want to do this before you get the coating applied.

I believe that the O2 sensor will reach without modification.

You will want a new exhaust gasket, O2 sensor gasket, and header collector-to-Cat gasket.

The O2 sensor location works pretty well, so it's about as close to bolt-on as you can get.

Dale