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Caveman Hammer Mechanic
 
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993 Exhaust on 3.2

Survey,
How much flow difference between 993 exhaust headers vs SSIs? Swapping the flanges is no biggie, just thinking about my next hare brained potential project. Anybody have dyno info on these installed on a 3.2.
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Old 06-01-2019, 08:19 PM
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1 5/8" vs 1 1/2" tube size for 993 and SSI's respectively.

Generally accepted that 1 5/8" is the ideal size for a street 3.2. Standard 3.2 headers are this size BTW.

I've Googled and used the various search functions on and off for 12 months planning my 3.2 rebuild but found dyno comparison info to be pretty scarce on 3.2 (including the common 3.4 upgrade). Sure most people dyno their cars but very few do before and after comparisons.

First thing to decide is if you want heat or not and how much you want to spend.
Old 06-01-2019, 11:36 PM
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The later 993 Bischoff heat exchangers supported over 280 hp, if I remember correctly. I have a set that I plan to use on a 3.5 build.
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Old 06-02-2019, 03:27 AM
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Cost is another big factor. I spent less than $500 on the 993 set, with the flanges already flipped.
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Old 06-02-2019, 04:18 AM
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I ran that setup on my ss 3.2 turbo engine and it was fantastic.. Though they are unequal length there currently is not a better 1.625 heat exchanger set up out there for a 911.... Most 1.625 heat exchangers are not the ideal 31-32" length primaries.. Just a quick self promotion my 914-6 heat exchangers are all the above but that's not what your asking..


On another note mufflers get to be a challenge with the bischoff or Gillett setups.
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Old 06-02-2019, 04:42 AM
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Quote:
Originally Posted by mb911 View Post
...........

On another note mufflers get to be a challenge with the bischoff or Gillett setups.
Will require custom-bent tubing to direct exhaust in and out of a correctly-sized and formatted muffler - more of a challenge with Gillett HEs due to the exit angle of the exhaust flanges. However, nothing is sacred with a welding/cutting torch and a tube bender.

Sherwood
Old 06-02-2019, 03:40 PM
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Lol you forget I use to make mufflers for this setup when I owned m&k so well versed in this set up.
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Old 06-02-2019, 03:45 PM
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I plan to use the Vibrant side inlet, dual end outlets muffler. Basically the same configuration Porsche used for the 993 catalytic converter.
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Old 06-02-2019, 06:22 PM
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Quote:
Originally Posted by 911pcars View Post
Will require custom-bent tubing to direct exhaust in and out of a correctly-sized and formatted muffler - more of a challenge with Gillett HEs due to the exit angle of the exhaust flanges. However, nothing is sacred with a welding/cutting torch and a tube bender.

Sherwood
I was looking at M&Ks custom built 3.2/993 muffler set up and thought, better headers, M&K music, sounds like a plan. Big question, Bischoff or Gillette?
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1984 Carrera El Chupacabra
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"Easy, easy, this car is just the right amount of chitty"
"America is all about speed. Hot,nasty, bad ass speed."
Eleanor Roosevelt, 1936
Old 06-02-2019, 06:36 PM
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