Question About Headers
Thread Starter
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Question About Headers
My '85s exhaust system is all original except for the Magnaflow Catback, which conisists of the rear Y pipe and mufflers. I want to install Hooker 2151 headers, but understand that they are meant for true dual exhaust systems. So does this mean i'll have to ditch everything but the mufflers and just buy some piping to reach the mufflers?
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
It means you'll be ditching the stock manifolds and stock Y pipe and precats. Every thing before the cat. Thats all. You'll need to buy an X pipe or Y pipe to bridge the gap between the header collectors and cat.
Good luck and enjoy the increase in power.
Good luck and enjoy the increase in power.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Well, actually if you are going to true duels the x pipe is the way. Which will involve having two cats to stay legal. The Y pipe is used if you want to use your existing single cat.
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
I just did my 85, I came off the collectors and made my own pipes for each side out of prebent tubing I got at Advanced Auto. Once I got the two pipes into the tunnel area I installed two high flow bullet cats, then an x pipe. Then I cut the original catalytic converter flange off the rear y pipe and used straight tubing to connect each pipe together. The result is a great sounding TRUE dual exhaust. With the exception of the two cats and the x pipe, the total cost of my exhaust was about $30.00. I already had the cats and x pipe when a local exhaust shop quoted me $400. to do the job.
Team Owner
Joined: Sep 2001
Posts: 62,180
Likes: 1,740
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
2151s bolt to the same 16720 front Y pipe that the 2149s do, so you dont have to run a true dual exhaust.
the 16720 is not restrictive
the 16720 is not restrictive
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by vader86
2151s bolt to the same 16720 front Y pipe that the 2149s do, so you dont have to run a true dual exhaust.
the 16720 is not restrictive
the 16720 is not restrictive
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Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Originally Posted by CentralCoaster
The 84-85 use a 4 bolt flat flange at the cat, not sure that'll fit without some welding.
i had no idea mine was broken inside until i pulled it off