CL55 AMG, CL65 AMG, CL63 AMG (C215, C216) 2000 - 2014 (Two Generations)

Renntech AirBox

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Old 05-11-2013, 12:51 PM
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'06 CL55 AMG, '08 SL65 AMG, '09 e550 4Matic, '13 Range Rover Sport Autobiography
Renntech AirBox

Read a bunch of threads about Renntech's CF airbox. Was wondering if anyone can provide a first hand account if the airbox upgrade is worth it. Was looking at the following: http://www.renntechmercedes.com/www/node/56

Can anyone verify if you actually get any HP gains and are there any downsides whatsoever in installing this airbox on a CL55?

I know it's expensive, but money aside, I want to hear from other members who have installed this and what their experience has been and if there is any concerns I should have with installing it?
Old 05-13-2013, 10:41 AM
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2003 CL55
I dyno tested both ways (stock VS ren CF box) and could not find any HP gains. Box looks nice and fit well, but still uses the same stock size filters. It does smooth some air flow out in the neck area but again, seems like stock size filters are the real bottle neck.
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Old 05-13-2013, 03:33 PM
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Which size did you dyno test? regular size or the larger 82mm?
Old 05-15-2013, 10:46 AM
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'06 CL55 AMG, '08 SL65 AMG, '09 e550 4Matic, '13 Range Rover Sport Autobiography
Is it common knowledge and does everyone agree that the Rennetch airbox, regardless of the size does not increase HP?

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