So far since owning the forester ive upgraded the turbo to td04 from tf035 ive got the stainless steel bell mouth down pipe with decat and also my middle section is also a decat.Im yet to replace my up pipe with my new stainless steel piece but always wondered if the back box is restrictive on the forester? The back box its self looks massive apart from the actual tail pipe

Not sure mate how's she sounding now what diameter does the middle section go from to the back ?

I had the full lot replaced and they built me another rear box which was the same size as stock. I'll stick a picture up when I have time

From down pipe its 3inch into 2 1/2 inch.middle section is 2 1/2 inch mating up to the back box

I'd expect it would be limiting performance a bit, although its probably neglible.

 

i'm planning to get a stainless steel cat back exhaust and depending on the price, i might go for a sports cat. 

My back wont last long lol it has more holes than a Tetley teabag lol its been welded about 20 times by who ever has owned it before