SLK55 exhaust Drone - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 06-07-2015
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SLK55 exhaust Drone

I have an '07 SLK 55 with resonator delete and Magnaflow x-pipe install. I later removed the secondary cats and now have a minor drone sound at 1800 rpm. Anybody else experience the same? I am considering the installation of dual small resonators as a solution. Any suggestions?
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#2 Old 06-07-2015
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Hmm I haven't got any noticeable drone on mine, although my X pipe is not the same as yours?

Perhaps someone will comment who has same as yours to rule that out.

Definitely no leakage from the work done is there?


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#3 Old 06-07-2015
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No noticeable drone from mine either, although my x-pipe was custom-made, not Magnaflow... I know that @Col has a Magnaflow x-pipe with 2nd cat delete, but I haven't heard him complain of a drone either... perhaps Col will add his input here when he sees the thread.

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#4 Old 06-07-2015
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1800 rpm

Don't sit/lug at 1800 rpm.
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#5 Old 06-09-2015
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My Magnaflow setup is fine. After reading your comment regarding 1800 rpm I have tried to hold it there and listen a bit more. The exhaust note is deep in that rev range but not what I would call a drone! My car isn't usually in that rev range for very long unless I'm stuck in traffic!
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#6 Old 06-10-2015
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My drone-free lash up

My drone-free lash up.
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#7 Old 06-12-2015
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Bragging or complaining?
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#8 Old 06-14-2015
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Has anyone removed secondary cats and resonator without cross pipe?
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#9 Old 06-15-2015
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My drone free lash-up pix:
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#10 Old 06-16-2015
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I think that you are correct - it is not really a drone, but more of a very deep booming. It actaullay lasts from about 1700 to 1900 rpm as I accelerate. Not a major problem, but I dont care for that tone. Thanks for everyone's help!
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#11 Old 07-15-2015
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I have a feeling I'm gonna get to learn all about this very soon... Just now I'm dropping in the Kleemann's, deleting the first cat and swapping in a custom X-pipe that deletes out the second cat and resonator.

Still on the fence on the second cat and resonator delete but I'm really tempted..

Last edited by Lioninstreet; 08-10-2015 at 07:49 PM.
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#12 Old 07-25-2015
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Do it!
You won't regret it
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#13 Old 08-09-2015
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Quote:
Originally Posted by eps930 View Post
My drone-free lash up.

@EPS

what setup do you have in front of that magnaflow box?
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#14 Old 08-10-2015
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I ended up installing a pair of 12" long resonators in the location where the secondary cats were removed. SO the exahust system now consists of secondary cat delete with x-pipe and twin straight through resonators. I really like the sound now. I should mention that I'm 59 years old, so maybe more sensitive to the loudness than you youngsters!
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