Power FC Tuning Do I need it???

[sr20tom]

Ok i got a 94 blacktop, GT2871R turbo, DC manifold and Greddy intake manifold and a #" Exhaust. I ran it on 93 octane 18psi and got 320rwhp on 550cc apex injectors and some mumbo jumbo program that was on a bikirom. here is the chart. I think the car runs like ass. It backfires, stalls and all the crap that you dont want on a daily driver to do and also eats a crapload of gas.


and then there is this dude that evans tuned for a power FC ($940) and tuning ($500) with the same set up for $1500 more and made $350 that made 335 on 93 octane at 17psi.

http://forums.evans-tuning.com/viewtopic.php?t=3673

Is the 15hp worth $1500??? If it gives me my 25mpg back and the car will run amazing like it did when it was stock then there is a consideration i think, but if the mpg will still suck balls then ill just stick with my 320, no?

Will this solve any of my proplems like MPG and is it worth it????