Exhaust question Tubro back vs Cat back

I know that a Tubro back is an exhaust from the down pipe to the end tip and a Cat Back exhaust is from the Cat to the end tip.

 

But what's the difference in power output and emission (AKA Smog check)?

 

Anyone have a list of exhaust available for the Legacy GT?

Thanks for any help

Ohh and it's a Legacy GT Sedan. I know Greddy makes 2 exhaust for the Legacy but they're both for the wagon only.

actually, turbo back is from the turbo exhaust housing and back to the tip (so it would be a downpipe plus midpipe and the 2 mufflers).

Catback is just from the end of your downpipe to the end tips.

 

Turboback won't pass smog

catback will pass smog IF you're downpipe is stock and holds the 2 cats. (i think)

 

Power output will have a difference (less cats = less restriction = more power)

but it won't be anything dramatic.

 

There are quite a few exhauts out. do a search.

AVO

Rallitek

Borla

Stromung (be sure to search for this on the forum, they are nice)

Where is the best place to put a cat? I want to run at least one, just ont in the uppipe. And would it be ok to run up+downpipe withoutECU management for a long period of time?

there's no need to have a cat in the up-pipe, that will definitely slow down the spool.

You can run up+dp on stock ecu, but you won't feel as much difference as compared to if you did have some sort of tuning.

best place for a cat is somewhere on the downpipe.