CAI Kits: Whats the difference?

[blackrauder]

I have seen the K&N CAI kit, all both of them one is #63-1111 and the other one is #57-2563 and is CARB certified. What is the difference?:help:

[blackrauder]

Hello anybody there?

[DEFYANT]

Cold air is more dense. Therefore, more O2 in the engine. But with out a proper retune, you will not get the maximum benefits.

[freakstatus]

I could be wrong but I thought the 57 replaced the 63. The reason I have the 63-1111 is because thats what they had in stock at the time.

[blackrauder]

Oh, ok i was on amazon and I saw both the 63-1111 was cheaper, I was jus wondering.