All i know is what i read on this forum. I recently bought a GT3255A from a member here and installed on my project car awhile back. I am in the process of buying/installing a block off plate on the exhaust housing because the wastegate hole was enlarged and the puck on my stock elbow will not seal it. Once i install i can give you a first hand review. Until then, you may want to do search on this turbo. They made the GT3255A which has the TA49 Cover (ie stock appearing, as you know) and the GT3255E which has the "E" cover. There is a handful of guys that talked about this turbo in the past and they all talked about how fast it spooled. From what i read it was made to replace the TA49 and has the "GT" wheel and precision .63 housing. When searching type in "GT3255" and i think more threads may come up.
HTH
-Sal
