This turbo will make just as much horsepower if not more than the Turdbonetics 88mm. The compressor wheel in that turbo was old school technology. I'm expecting about 500rpm better in spool up, maybe more. This compressor wheel is billet and much, much lighter than the cast compressor, not to mention is 5mm shorter tip to tip. Also, the turbine wheel in this new one is a bit smaller than the Turdbonetics turbo. New school technology, lighter wheels on both sides, should make the car more responsive down low.
Cal, that's a good question. I don't know what the actual rating is. I do know that I have a friend of mine with a Mustang that weighs 3200lb, small solid roller, 331ci, t400 trans, 3.27 gear, etc... Last fall with this same basic turbo he went 8.30@170mph with a 1.40 60ft. So, this thing will make some serious steam. Mine is t-6 hotside w/1.10 a/r. His is a 1.32 a/r. Mine has an 83mm turbine wheel, while his has an 87mm turbine. You can get up to a 96mm turbine in the t-6 hotside. In a t-4 87mm is the biggest you can go on the turbine.