I put one in (drop in, not open air) my car before I had the ECU upgraded. Did not notice a thing. I am sure that once I upgraded the ECU, it helps.quote:
Originally posted by Kermit:
I was wondering if any of you have personal experience with K&N on your S60 T5. How much difference to you notice, I know that it is a relatively cheap mod for the proformance it is said to give and I am curious if it is all true. Thanks for your help.