Hey my friend has a 04 350z auto tranny. So far he has a borla catback and stillen intake. and crank pulley

he is currently running a 14.0 qtr mile time.

what im wondering is what mods will he need to pull his time down to a 13.5?

i was thinking high flow cats, pleneum spacer and a reflashed ecu.

would this bring him down to about at 13.5?