SL/R230: K&N Filter
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Joined: Feb 2004
Posts: 3,703
Likes: 5
From: Arizona
SL55AMG, Ferrari 348, Ferrari Testarossa, Ferrari F40, Ferrari Mondial t, Ducati 916, Indycar
On as stock set up you may notice a slight improvement. With our ECU tuning, I always suggest that the client get a set, and what I hear from the guys is that they may not have initially bought the filters, and enjoyed the performance improvement with ECU alone, but when they put the K&Ns in, it took it to another level.
