That sounds way too high...

a friend of mine had a 95 GSR that ran 14.9 with just a 3" cat back (Yes, I know, 3" on a stock gsr :doh: )

all that stuff should atleast put him in at low 14's. Maybe he's having trouble with control and wheelspin. Tell him to get it tuned then get some slicks...or to learn to drive. depending on what is required most.