06 wrx upgrade???
I have an 06 wrx with A turbo xs downpipe with an apexi cat back a Cobb access port and an aem cold air intake, I'm wondering and hoping someone could tell me what kind of advantage an aftermarket up pipe would give me at this point as far as horse power, sound, turbo spooling etc.... Would like my exhaust to carry a little deeper of a tone not sure if that would do the trick. But aside from that wondering what my next "affordable" upgrade could be to get a couple more ponies outa this thing. I appreciate any suggestions and or constructive critisism. Thanks in advance.