I'll find out for certain. My car made 571rw uncorrected but it was spinning the tires past 104mph (5,100rpm) with anything over 10psi of boost. You can see the graph for yourself here . I really think it would have hit 650 or so if the tires stuck, I was on 275/50/15 drag radials btw. The engine on the bottle had it's power peak at 6,100rpm before. It sure felt a helluva alot faster than the mid 10's it ran with the nitrous

 

Note: If I remember correctly we tried 14psi with a little more power as a result. We were running out of time though so we got stupid and tried 20-21psi and went BOOM!.

 

550-600 is most likely the max of the TTi kit as was said above. Personally, I'd like to use most of the TTi kit, max it out, and THEN build some slightly better parts and see what improves. Moving the wastegate so it will control all the exhaust and not just one bank is just one is a thing I'll change.

 

I still use the stock crossover thats only 2 1/4 inches. I plan on putting a flexible peice of braided stainless exhaust in the crossover so the flanges will seal better. I looked into moving the wastegate, but i really don't have the room unless I route the wastegate vent on top of the log, and that wouldn't really look all that great. I run the ATI twin intercoolers and the area in front of the turbo is packed.

Bill