Pretty much any catless FLEX uppipe will be fine. Subaru Specialists has frequent specials on theirs, $315 installed I believe.
Downpipes are an excellent mod as well. What diameter is your catback? If it isn't 3", I would plan on buying a complete turboback and selling the Magnaflow when you get it installed. I'm not sold that divorced wastegates are better than a good bellmouth- Vishnu's Signature Series turboback exhaust, with a divorced wastegate, actually tends to make slightly less power the the standard Aussie bellmouth one.
I would also highly recommend making the trip down to Nate at subaru Specialists for an Ecutek reflash, especially since you're running a cold air intake. Those are notorious for wreaking havoc with A/F ratios on a stock ECU, and many actually lose power.
A WRX with uppipe, turboback, and reflash makes around 50 extra whp on Nate's dyno. Well worth looking into.
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FWD is the new AWD
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