That is why I started with a 5 star tune. I already had an X4. In the end, the 5 star tune wasn't that great, at the time I thought it was good as this was my first tuned vehicle that had factory boost. I thought the 40 hp or so was great until I tried ZFG, I'll never go back. I already had an HP tuning device so the switch to ZFG only cost me $650 (450 for the tune and 200 in credits).
Like Boss240 said, if you're starting from scratch, just go ZFG. A tune, credits and device will run you about ~1K from ZFG, a tune and device from 5 star will run a minimum of $700, your money, you decide.
For comparison, my best dragy time with the 5 star and the whipple I/C was a 12.72@109.50, my best with ZFG--12.09@112.30