Depending on the make of CAI you may gain or lose. One thing, I have been talking to a dyno guy and he says every type of CAI that makes a bend to the fender gains nothing or loses because it disturbs airflow to the MAF. Most of the gains are limited to a few HP. but if you plan to put on P&P heads, intakes and a cam it would be wise to get something that flows more air than the stock in air intakes system.