Difference between 2003+ K&N CAI's??

[02V8Sport]

I see a 69 series which is the metal tubing, but

there is a 63 and 57 series also available which are both the plastic type tubing, what is the difference between the plastic tubed ones????

K&N part numbers 63-1109 and 57-2562

 

[02V8Sport]

Sorry guys, got the answer from K&N, the 57-2652 is the replacement for the discontinued 63-1109 part number, It seems to be about $20 cheaper now too.

 

[GrayGhost1]

Also, the 57 series units are CARB certified.