The difference between a metal vs plastic intake setup is hardly noticeable.
Here is a couple things to focus on when deciding between intakes for any vehicle. Add more too the list if I forgot anything.
1) Does the intake remove all of the factory restrictions?
2) Is the system an open element or closed air-box style system?
3) If using the factory air-box do they seal it off from the engine bay?
3) What type of materials are they using? Example: high temp rubber vs silicone. hose clamps vs silicone safe hose clamps.
4) How many different bends are within the system and the degree of the bends?
5) Will my Intake Air Temperature be higher after the intake is installed? Lower the IAT = less timing being pulled.
6) What type of filter is being used within the system?
7) Are detailed removal and install instructions included with the system?
8) Customer service and feedback from current users?
10) Can I get my intake coated? Example: Ceramic Coated or Powder Coated?
11) Do the tuners (vendors) on TB SS sites support that CAI or have a canned tune for that application?
I did not put price in the mix because that does not always reflect the best product. A lesser expensive intake could yield better gains and vice versa.
K&N filters will not void your warranty. Your local auto parts store carries CRC electronics cleaner which is non dielectric. That will not harm your mass air flow meter.
I would love to take a poll on. Did you purchase your k&n or volant intake before you joined the forums? Did you do any research on other intake options prior than buying? Excludes price shopping.