So the bpv on my dads car is starting to hoot and compressor surges quite a bit. Does the stock Viggen bpv leak boost at all? Time for aftermarket bpv?
By 2000 or 2001 all saabs had the "Viggen" bypass valve in them. So, other than fixing a broken and leaking part that it sounds like you have, you will see no performance gain over what you had before your valve began to leak (if that is actually your problem here).
as mentioned theres no performance gain just more reliable. plus if your running silly power will dump alot faster and a greater volume reducing the tendancy to rev up between gearchanges.
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