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Discussion Starter · #1 ·
Looks like it is time to replace the 165k mile stock dual exhaust system on the SSuperwagon.

Performance is important
But looking for quiet Performance.

Considering replacing the Stock Exhaust Manifolds.
BUT
With a good Heavy Guage Header.
and
Keeping stock Cats
and
a good crossover system for better flow.
and
Stock Diameter system for better fitment.

What is out there that works?

Dan
 

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Performance is important
Stock Diameter system for better fitment
Considering replacing the Stock Exhaust Manifolds.
BUT
With a good Heavy Guage Header.
Conflict - Why would you want to put the same stock diameter if your looking to improve performance?
 

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It's all as close as your pile of U-bends and welder.

CIA "original" TriYs
Make a straight across the car transmission cross member. 70'sh "A" body is a good start.
This gives you enough room for the factory cats.
Cut the head pipes from the cats and make down tubes from the headers to sit the cats beside the transmission.

Make an Xpipe.

Walker 17749 mufflers are a good balance of sound and power

Make up tails with Ubends exiting where you choose.

With your background and experience shouldn't be much trouble
 

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Discussion Starter · #6 ·
Conflict - Why would you want to put the same stock diameter if your looking to improve performance?

Because of experience...

You get a big flow increase when your use an X/H pipe.
Having flow access through both Mufflers.
The extra 1/2 inch is not goig to add much considering the Wagon will be used as a tow car.

I am more concerned with HEAT generated.
Larger Diameter Pipes get too close the air bags.
I have had the larger pipes melt holes in the Bags despite having a Shield installed.

For towing you want as much hp and torque below 5000 rpm that you can reasonably get.

Larger pipes really do not help that much unless you have an engine revving consistently over 6000rpm.

Hope that helps

Dan
 
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