Originally Posted by blehhh
You need a tune.
You've completely thrown off the mass air flow sensor by altering the intake piping. A correct tune will have MAF scaling to dial it back in.
Usually aftermarket intakes are larger piping, so slower moving air, so lower MAF readings, so less fuel. but since it's actually more air, now being given less fuel, you're leaning out an already incredibly lean tune.
I completely agree! As long as hes driving like a 90 year old, he should be okay. I would get a tune quick bud!