X2. There is no law regarding noting the filter is aftermarket. Just a sticker that says don't throw it out as it is a lifetime filter.

Coming to think of it, I can't think of a single aftermarket part that "requires" you to put on stickers. I've never seen stickers on any Hot Rods made by Chip Foose or Chuck Boddington. It's typically just a good idea to put the stickers on though.

 

this filter works awesome!, sounds great and works great, there was definetely an improvement in horsepower

i personally love the sound though

 

the sticker on some performance parts is for cali laws and that is it as far as i know because when i first build my 305 for my monte it hade all the stickers with numbers and bar codes to be smog legal in cali like my edelbrock parts and my accel ignition system but that all i seen

 

I can't say about the horsepower, but I drive 100+ miles per day commuting. I had the car 2 weeks and averaged 22.5mpg. I then put on the K&N intake, and now average 24.4-24.7mpg. 44,000miles driven since purchased translates to a savings of 159.5 gallons of premium gas. At $3.00/gal, I've saved over $478 in gas. My K&N has more than paid for itself! Plus I've saved $200! Thanks K&N.

I did not get a CARB sticker, nor do I have any other stickers under the hood, only the K&N logo on the intake.

I do have a custom Lexan clear cover to help with the underhood heat problem. I am about to make another new one for show. The old one was free scuffed material, but works great.

I usually can't hear mine because of the stereo cranking.

http://www.cardomain.com/ride/2319272