Finally got the rest of my parts from Irate and got them all installed.
I've only driven it maybe 15 miles with the 366 on there but from what i can tell is that there is a major difference. The d66 was laggy, made the egts hot, and was very smokey. The 366 comes on way sooner, egts are very manageable, smoke is non existent unless you really push it hard. With the uppipes leaking on the d66 i could only see 22 pounds of boost or so and now it will hit will easily hit 30 and can steadily climb to 35+. I gotta watch that since i have no studs, springs, or push rods yet.
Overall. Much more enjoyable truck. Anyone on the fence about a t4 kit, I highly recommend one of Irate's kits.
If i had to say something bad about the kit, it would have to be the short down pipe. Proved to be very simple to connect to my already existing exhaust though.