View Full Version : Stock exhaust diameters

04-02-2005, 06:58 PM
Can anybody tell me what the stock exhaust pipe diameters are from the manifolds back?

04-02-2005, 07:21 PM
I believe that they are 2 1/4 inch.

04-02-2005, 08:21 PM

1 7/8th to 2"
then dual 2 1/4
to single 2.5
then 214 out teh back

XR7 Dave
04-03-2005, 03:52 PM
Pipes depend on the year.

89-93 have 1 7/8" head pipes.
94-95 have 2 1/8" head pipes.

All have very restrictive resonators and/or converters.

89-91 have 2.5" mid pipe.
92-95 have 2.25" mid pipe.

89-91 have 2.25" tail pipes.
92-95 have 2.0" tail pipes.

All have the same mufflers as far as I can tell.

93+ have three cats, 89-92 have only 2.

94-95 have an improved downpipe and front cat arrangement but still have a 3rd cat downstream.

If you were using stock pipes, the 94/95 manifolds and y pipe are the best, but you'd want to replace the 3rd cat/resonator with a good resonator. Then the early style mid/tailpipes are best but they only fit the early style tank.


04-03-2005, 07:57 PM
My 94 auto has 2 cats and a resonator..Ford parts..Perhaps it was changed at one point...Also 94/95 I believe had double walled tubing in its front pipes