dear lord! do you have a boost gauge installed in the car? if so, did the boost spike insanely high? if your only 2 mods are a downpipe and catback, and you're still hitting boost cut at 12-14lbs as a near stock supra w/out a bcc would, I can't imagine the turbo's going bad so quickly.. how many miles are on the car? i'm shocked!
lemme ask - what's the car doing to make you think the turbo's are blown? i hope it's just a blown IC pipe or something simple..
car sounds nice man. i have a question for anyone who can answer it..since this is an exhaust related thread. what does an upgraded twin turbo supra sound like? i've never heard one in person or from the outside in a video. cause it seems to me that tt supra's sound completly different then a single. and that's just based on in car video's i've got of hks twin turbo supra's.
the valve stem seal replacement on the MKIV's are pretty common - i'm getting ready to replace mine, myself. good thing yer turbo's arent bad!
I went through Jeff Watson at Champion Toyota to get my valve stem seals - however, i'm sure either him or Curt Aigner (Elmhurst Toyota) would be more than able to help you out. They both have a thread dedicated to their dealership here on the main forum, and are very knowledgeable and helpful folks. hope ya get them seals taken care of!