hopefully you fiogure out the issues. Trying to get 300whp is going to be tough without a decent amount of money into mods. I see 275ish being do-able without a turbo upgrade. without changing turbo or doing a lot of fueling, I would do, intake, exhaust, downpipe, fuel pump, big tmic, and a re-tune. injectors, turbo inlet and boost controller wouldnt hurt. If youre going to get get it tuned, have all your modifications installed or ready to install so you don;t have to re-tune a bunch of times. good luck and keep us posted with your progress. I love my 05 sti, but when it comes to moving... i wish i had a hatch for the cargo space.