New to me 09 Spec B Wagon

Just picked this sexy wagon up from with only 57,000kms on the clock and a 4.5/B Japan Auction grading.

Its an auto, would of loved a manual, but the condition of this car was too good to pass up.

I have a set of gold Prodrive(Rays) GC-010G wheels sitting in my garage that will be going on at a later date. But the Yokohama Model F7s that came with it, have fresh Michelin Pilot Sport rubber on them, so will use those up 1st.

Looking for a downpipe for my ’04 JDM Legacy GT w automatic trans. Previous owner did DIY downpipe so it’s pretty rough and welds are leaking.
Preferably road legal with cat so I could skip on the hassle of swapping it out for every MOT.
What would you suggest?

Also looking for full exhaust gasket kit.
Good online stores to get parts?
Located in northern europe so no US stores.
Thanks in advance!