I am in the middle of developing a turbo kit for the QG18DE and QR25DE as well. They will be available this fall at the earliest. Check out the B15sentra.net forums for more info on pricing and components used. It's in the performance section in the B15 forums. Feel free to contact me as well...
Travis_311@yahoo.com or you can call me. I am looking for a 1.8L and 2.5L engine to test the prototype kit on. Anyone interested please call or write me..
Thanks
Travis Burelle
Forced Induction Racing
(985)493-9729