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air release sound after releasing accel 700

Accelerating and then letting off I noticed a big air release sound similar to the sound Semi Trucks make with their brakes. Looking under the hood I saw that I had lost a bolt on a regulator that I am unfamiliar with and can't find in my cheap books. I have put up 2 pics and was wondering if someone could tell me what this piece is so I can order the respective nuts (there isn't a yard nearby and no other car for now) or is it ok to drive like this about 40mi to the nearest yard/parts store? Also where can I get a detailed book that would have described this piece for me? I looked on volvotechinfo.com but can't figure out which guide ot order.
Pics:
Regular
http://www.servano.com/images/740turbo_nobolt1.jpg
Zoomed in
http://www.servano.com/images/740turbo_nobolt2.jpg






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New air release sound after releasing accel [700]
posted by  servano  on Tue Jul 22 15:48 CST 2003 >


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