Quote Originally Posted by blindF
Haha, you guys JUST learned that? There are a couple things different on the 07's from the 04's.

Longer gears(3rd and 4th are longer)
Better flowing heads
Different turbo(VF43 instead of the original VF39)
And some other upgrades.

Upgrading an STi or any turbo car will increase it's power, lol not just low speed torque. If you own an STi I recommend you check out wrxatlanta, because you sound like a complete noob right now.
NASIOC is an excellent resource as well. Excellent FAQ section.