i am looking to buy a down pipe and a catback exhaust for my 07-wrx tr. im thinkin the ERZ performance stuff.
after that i want to get some boost gauges and i was thinking the cobb ap as well.
anything seem out of place? or better ideas?

 

Never owned anything by ERZ but sounds like a good plan. If it were me I'd start out with the boost gauge, AP and then the TBE. I'm pretty sure your upipe is catless already but if it isn't that would go to the second spot. This would be the safest way to mod your car.

enjoy

 

Definately get an AP! wat kind of power are you looking for? wat are your goals? that wat you have to think about..

 

Here you go my friend, This might help you out!!
https://www.i-club.com/forums/tuning-services-installs-148/%2Acobb-tuning%2Aaccess-port-do-yourself-tuning-166768/