i had the same thing happen to mine. turns out it was the turbo. make sure you keep an eye on your oil level too. oh and itsa great excuse to get a new turbo =)
this has been covered more than once lets just say ;). use the search button it will help in a big way. i wouldnt bother shimming the wastegate until you know what your doing yet. goodluck!
i wouldnt run the lex afm without the 550s. i did for a couple days and it would start bog around 4k. just do the mod the whole way threw 550s and fpr included. youll be thanking yourslef when your done.
im almost positive the a.r is 58. they have an after market exhaust housing you can buy thats an 81. http://www.suprasport.com/BOSS-Turbos_ep_41-1.html
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