If you really really have/want to put an exhaust on even though you're selling
I'd suggest getting one from Troy from Prospeed, it's cheap as chips and is a Trust PE2 cat back exhaust for $499. (forum name "Trexx" or look in the vendor section)

These are high quality jap systems and usually sell for $900.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO