Mix & Match Question 85 exhaust on 83-84 cars
01-10-2007, 03:02 PM
#1
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Mix & Match Question 85 exhaust on 83-84 cars
I see 928 SP sells an X-pipe even for OB cars, since the 83-84 cars have a single pipe exhaust setup, would an 85 dual piping exhaust system from the cats on back bolt up to an 83-84 without problems if it were to already have an X-pipe on it?
01-10-2007, 03:05 PM
#2
Administrator - "Tyson"
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For a US 16V car, a 3" with a Y collector will flow enough air. The duel pipes on the 85-86 setup are pretty small IIRC. It's been a while since I've seen one.
My 79 made over 210 - 225rwhp (depends on what dyno chart I post & what calculation) with only headers & single 3" exhaust.
Swap out the manifolds for 85-86 units - use a good 3" exhaust from one of the vendors.
With the 85-86 manifolds you will need a spacer for the left side - the guys in Utah sell an exhaust for this setup & the spacer.
My 79 made over 210 - 225rwhp (depends on what dyno chart I post & what calculation) with only headers & single 3" exhaust.
Swap out the manifolds for 85-86 units - use a good 3" exhaust from one of the vendors.
With the 85-86 manifolds you will need a spacer for the left side - the guys in Utah sell an exhaust for this setup & the spacer.
01-10-2007, 03:17 PM
#3
Race Car
Yes.
The x pipe or a later dual-cat bolts directly to the OEM manifolds (although as mentioned the '85/'86 are viewed as an upgrade but require the spacer) and then there are no problems fitting the '85/early 86 dual setup from the cat all the way rearward. Some people have articulated the view that the dual pipe system is a bit restrictive where it passes under the rear cross-section, the pipe there is deformed for clearance in the factory setup. Still, it was intended for a 5.0 so I don't think its likely to impede performance on an earlier engine (although it may not be optimum, either).
The x pipe or a later dual-cat bolts directly to the OEM manifolds (although as mentioned the '85/'86 are viewed as an upgrade but require the spacer) and then there are no problems fitting the '85/early 86 dual setup from the cat all the way rearward. Some people have articulated the view that the dual pipe system is a bit restrictive where it passes under the rear cross-section, the pipe there is deformed for clearance in the factory setup. Still, it was intended for a 5.0 so I don't think its likely to impede performance on an earlier engine (although it may not be optimum, either).
01-10-2007, 03:21 PM
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Originally Posted by SMTCapeCod
I don't think its likely to impede performance on an earlier engine (although it may not be optimum, either).
Unless Stig has an 85-86 duel setup lying around.
01-10-2007, 03:30 PM
#5
Race Car
I was simply answering his question, not advocating or asking 'why'.
I'll add one opinion though- the exhaust tone question is very subjective, but the '85 system with no cats is quite loud (for some of us)!
I'll add one opinion though- the exhaust tone question is very subjective, but the '85 system with no cats is quite loud (for some of us)!
Last edited by SMTCapeCod; 01-10-2007 at 03:46 PM.
01-11-2007, 12:40 AM
#6
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Originally Posted by SMTCapeCod
I'll add one opinion though- the exhaust tone question is very subjective, but the '85 system with no cats is quite loud (for some of us)!
01-13-2007, 12:18 AM
#7
Nordschleife Master
The trouble with my 83 at least is that the battery box extends forward a few inches so there isn't enough room for the later exhaust passenger side pipe to pass between the battery box and transmission. It is possible to route the pipe below the 85/86 path, but it needs to bend down and then back up on the other side. Running a single pipe from a Y is a better solution.
