This compares the 6262 but they are very similar.
Here are the specs for the GTX35R:
Garrett GTX35R wheel sizes Trims Stats
http://www.enginebasics.com/Advanced...5R%20stats.png
Here are the specs for the PTE6262
Compressor-
BILLET Wheel Inducer: 62mm
Wheel Exducer: 82mm
Turbine Wheel -
Wheel Inducer: 72mm
Wheel Exducer: 62mm
You will notice that they are identical on the compressor side of things, but where they are different is on the exhaust side of things. The PTE6262 has a 72mm inducer size turbine while the turbine inducer size on the GTX3582R is 68mm. It is no surprise then the 6262 makes more peak power up top, while most dyno’s have shown the GTX35582R to have more midrange power.