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Posted by: BuddyV Oct 14 2019, 07:07 PM

So.... I see that the rear exit plumbing on the 1.7/1.8 SSI exchanger model does an "S-Curve" in the upward direction...… making it impossible to attach a stock 2.0 muffler.

The 2.0 SSI exchangers have more of a STRAIGHT design to the exit flanges.

Question: Other than the shape of the exit flanges, is there any difference in the internals of the two designs? Does the 2.0 have larger diameter tubing? Better flow?? Or is the only difference the rear flange design?

I just realized that I have 1.7/1.8 SSI exchangers on my 2056 motor..... I realized this when I attempted to attach my (new to me) stock 2.0 muffler

Looking to learn before I start removing/swapping/customizing/ruining

Posted by: mepstein Oct 14 2019, 07:09 PM

Same ID/OD so they flow the same. Just different in the exit direction. and need a different hanger and muffler.

Posted by: VaccaRabite Oct 15 2019, 09:43 AM

The less bends the better in terms of airflow.
But I bet not even a dyno would be able to tell the difference in airflow between the 1.7 and 2.0.

Zach

Posted by: mb911 Oct 15 2019, 02:03 PM

Height of the inlets and flange spacing are the biggest difference

Posted by: Olympic 914 Oct 16 2019, 07:45 AM

Check the classifieds Someone has a WTB for a 2.0 muffler.

Then you can start looking for a 1.7/1,8 muffler to match your SSI HE

You will also need the 1.7/1.8 bracket, if you don't already have that part.

Posted by: rhodyguy Oct 16 2019, 07:50 AM

And the correct HE to muffler gaskets. 2.0 style vs 1.7/1.8.

Posted by: johnhora Oct 16 2019, 08:27 AM

As mentioned above the real difference is in the pipe exit at the rear.
Which equates to a different hanger and muffler.
This may help.

Posted by: Triaddave Oct 19 2019, 04:15 PM

QUOTE(johnhora @ Oct 16 2019, 07:27 AM)

As mentioned above the real difference is in the pipe exit at the rear.
Which equates to a different hanger and muffler.
This may help.

Posted by: TheCabinetmaker Oct 20 2019, 12:27 PM

The only numbers that matter for the 75/76, are the horse power numbers that drop cause of the exhaust.

Posted by: Triaddave Oct 20 2019, 01:34 PM

QUOTE(TheCabinetmaker @ Oct 20 2019, 11:27 AM)