I got a 2006 mustang with the 4.0L engine. it has a cold air intake and true dual exhaust and that is really the only power adds to date. I am interested in getting a wet NOS kit. I was thinking 75HP shot. Does anyone here have nos on a 4.0L? if so how is it? worth the moeny? I know stock motors can not handle a lot of NOS, but 75 would be fine, or would any NOS kill the engine quicker over a short time?