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Not much of a difference as far as gains. I think a lot of it is a bunch of hype to make a sale. Now if you get the JetChip Stage I or II, you'll notice a difference with that all of the way around since it tells the computer what you have going on.
YEAH well i have cat back exhaust that custom exits out in front of the rear tire so that and an intake should that help with gas mileage? i mean i drove like a grandma never leting it get above 3000RPMS and yeah i got 15.5MPG and it wasn't bad but still i was like GOD this sucks!