there was another msp dyno at tecmotion(the place i went to for this dyno), that car was bone stock, and it made 127whp on mustang dyno. That gives you some idea on the gain of the exhaust
hmm....the guy at the shop told me mustang dyno put out 13.5% less than dyno jet on average. That's why he put 156whp equivalent for dynojet. As advertise, no change in boost level for the vibrant exhaust. I might jack it up to 8psi when I have the money for smic
I did my first dyno run today. It was on a mustang dyno in 4th gear. The only performance mod I have is the vibrant s-pipe back exhaust, with 94 octane pump gas and flashed. The car was running way too rich in lower rpm, here are the graphs
my car have the exact same problem as yours. I dont' know what the problem is, might be the exhaust hitting the cross member. That noise really is annoying