Bit of a tough call without a tune, or monitoring the current tune with Romraider or Btssm.
Although the stock tune is not particularly rated by anyone for ultimate reliability and driving satisfaction.
Technically, any cat back mods are stock tune compliant (according to the exhaust manufacturers) but personally I’d let my learning view results tell me.
So if you’re dead set on more noise, try a cat back, including the centre and muffs. Iirc avo, ultrex and tpc all do twin tips.
Or go a mid pipe with eg hotdog res, and gut the tbSTi muffs.
It has been done.
Or get the tbSTi tips attached to loud mufflers.
The actual Subi rumble is unequal length headers which technically, 2.5t Gt’s have, but perhaps aftermarket uel’s are more unequal
Being pre cat, you’ll probably need a tune, for which you’d get a 3” turbo back, anyway.
Having a wagon and being well over the hill, my current setup is... in my member profile.
But the muffs are modded wrx STi sedan muffs, 08+. (Hard to fit these on a lib sedan, if at all...)
https://www.google.com.au/search?biw=32 ... 6jGWNDNHRIHey I googled the forum for youse!!! (Gutted tbSTi mufflers)
Absolute tragedy the pics are no longer linked.
https://web.archive.org/web/20110307074 ... =10&t=4667Luckily the pages were internet archived in 2012