GT28RS

GT25/30 is really a HKS term for their version of the turbo.

Jus get a GT28RS, good for around same power as the turbo that gets known as a GT25/30 (330-350bhp), no lag, and a fuckload cheaper if it hasnt got a HKS badge on it.

Theyre all interal wastegate.

The turbo ive seen called a T38 is much bigger, and far laggier (not GT series) tho not mega laggy or anything, good for 450+ i think.