Drop in filters will give you some extra hp, but usually not enough to feel it in the seat of the pants.

 

Is possible to send me a link on this site with specific installation instructions? Waiting on a set to arrive for a 2005 limited roadster...any help would be appreciated. Thanks!

 

I would never use a K&N on anything I own. They basically flow a bit better at a penalty of letting a lot more dirt to pass. You will most likely not feel the difference, nor will you detect a mileage increase, but you will allow a lot more dirt into your engine.

Here's a quote from the article:

"Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt. "

Yowza!

ISO 5011 Duramax Air Filter Test Report

 

Iput 2 ru-1460 on mine and it made some differt noise over 3000 rpm
love it better floe always give u more power

 

I just finished cleaning & re-installing the K&N filters on my 07 Coupe. Original owner installed them. Fairly simple task. Biggest issue is waitng for the element to dry out after cleaning, which I did last night late so they would dry out during the night. Simple install and good for another couple of years, based on my driving habits (~ 3500 miles per year).

And for those interested, the Torx bit neeed for the covers on the filter elements is a T25.

Later,

 

Hey guys, is there a better filter than k&n in a cone. I have a k&n but i know that they let a lot of dirt thur. I would perfer a better cone filter even if throw away. Any ideas!