I had the water pump fail after installing the UD pulley and shorter belt - but with 120,000 miles on the original water pump its hard to find any correlation between the UDP and the water pump failure.
The UDP should prolong the water pump life by not turning it as many times as the stock pulley.
Read this thread: http://986forum.com/forums/general-discussions/37563-underdrive-pulley-questions.html
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 07-23-2013 at 11:48 AM.
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