3.2 exhaust?

[ParkerFE]

Do all OEM stock 911 exhaust systems come from the factory as 1-in/1-out or was there a 2-in/2-out or 2-in/1-out factory option?

[Stutzdriver]

1 in, 1 out with a catalytic converter, thank the US feds for what it was.

[ParkerFE]

How about ROW cars, did they have 2-in/1-out or 2-in/2-out mufflers?

[Stutzdriver]

To the best of my recollection, ROW is the same, Cat is replaced by Pre-Muffler in some markets. The HEATING system dictated the exhaust configuration for all markets.

You can check the factory parts drawings but I just looked and they list the same for all markets 1 in-1 out muffler with no other factory configuration or option shown.

Some have backdated the heat and exhaust but this would not have been factory installation for any 3.2

[Bill Verburg]

Originally Posted by ParkerFE

Do all OEM stock 911 exhaust systems come from the factory as 1-in/1-out or was there a 2-in/2-out or 2-in/1-out factory option?

Up through the '74 model year all 911 had headers that dumped into a 2 in 1 out muffler, the only exceptions were race cars.

911 from MY75 through MY 89 and 964 all(My89-MY94) used a header setup where the right side crossed over to the left and both were routed through either a premuffler or cat, thence to a 1 in 1 out muffler, 964 actually had 2 inline mufflers, both 1 in 1 out

MY993 was the first since MY74 911 2 have 2 in 2 out exhaust but is a somewhat different form, on 993 the 2 header banks were routed to a 2 in cat, early US versions(MY94/95) and RoW had a mixing chamber for the 2 inlets and then 2 outlets, US MY96 up 993 have 2 in cats but no mixing chamber, both sides are kept separate at all times, after the cat 993 has a 1 in 1 out muffler in each quarter panel.

[boss11]

^^^ great clarification regarding 993, thanks