Turbo won't boost - '92 300D
 

My turbo isn't kicking in and the transmission is shifting through all 4 gears by the time I reach 25mph. I don't know if these two problems are related but could use any help in solving the problem. I recently replaced the header exhaust pipe. I can't imagine that this would have anything to do with my transmission and turbo problem....but then what do I know. This makes for some scary times when pulling into moiving traffic.

Thanks,
dtimmester