front y manifold with no cat?

[douglas vincent]

My wagon is NA 1990. What years and models have the front Y exhaust manifold that is interchangeable with mine and does NOT have the catalytic converter at the Y?

Also, when people say you need a 3" pipe for turbo and 2.5" for NA for optimum results, where does this diameter of pipe start?

Thanks

[legacy92ej22t]

3" on turbo's start at the turbo then back, hence the term Turbo Back Exhaust (TBE). 2.5" on a N/A start's at the Y pipe, I would think, as most people don't do headers.

[Legacy777]

You'll need aftermarket headers for the 2.5 subaru engine to not have a cat. You'll also need custom from there to the mid pipe.....

[douglas vincent]

So the exhaust manifold for the 2.5 fit the 2.2? Usually? And somewhat bolt up to the existing exhaust?

[Legacy777]

yeah it will bolt up to the heads......as far as hanger position in the back of the header/manifold I'm not sure.

[THAWA]

The hanger postition should be the same, the thing about the y headers is, the flange is in a totally different place than our flange, so you need either a pipe from there to the catback, or the first cat section from a y pipe.

Also all the new subaru's have the y pipe w/o cat setup, wether ej25 or not, I believe they stopped using the y pipe w/cat after the bc/bf and about half way through the impreza line, like 95-96 or so