A little update, just put on an 08+ Sti magnaflow catback. It is a quad-tip kit, so I had to cut my rear diffuser. The cut is a little off, I'll be going back and cleaning it up a little bit when it warms up. I must say, I like the quad-tip look way better than the stock single exit. Not to mention the car sounds so much better now!!
AP stage 1 to come soon!