Yes sir. Just because the powerloss was tremendous with the stock turbo after 5500. So i hit 5th and gained a few more MPH...I do it with my evo too. and my evo's a 5 speed

Think of it this way, Your going thru the traps at 6900 rpms or so with an 07 STI with his mods. Now, at that RPM, your probably boosting 15psi? and making 250whp or so?

Shift to 5th at 6K, and your at full boost (21 psi with spike) and making your most WHP crossing at 6200 or more RPMS....

If you can shift fast enough, then your golden.