Is anyone planning on losing their secondary cats any time shortly? - Mercedes Benz SLK Forum

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

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#1 Old 04-17-2017
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Is anyone planning on losing their secondary cats any time shortly?

As it says on the tin, is anyone in the UK planning on ripping out their secondary cats in the not too distant future? I may be interested in saving you a trip to the local dump
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#2 Old 04-18-2017
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Hi,
Yes I'm getting a decat and new x-pipe done on my SLK350 on Thursday, 20th April. I'll ask if I can have the old cats when they come off the car if they are of any use to you?

Out of interest, I'm getting it done at Demand Engineering, near Stowmarket, Suffolk.

Demand Engineering - Custom and Performance Exhaust Craft
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#3 Old 04-19-2017
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thanks for the heads up on this - I'm in the middle of trying to figure out my next move (research this time rather than make a boo-boo!!). Looks like I'm going to stick with my headers (not entirely through choice ) but then I'll need to try and figure out if the standard secondaries can be modded to accept the O2 sensors (short term fix) or if a pair of new hi-flow cats would work better etc etc
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#4 Old 04-20-2017
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Quote:
Originally Posted by andybures View Post
Hi,
Yes I'm getting a decat and new x-pipe done on my SLK350 on Thursday, 20th April. I'll ask if I can have the old cats when they come off the car if they are of any use to you?

Out of interest, I'm getting it done at Demand Engineering, near Stowmarket, Suffolk.

Demand Engineering - Custom and Performance Exhaust Craft
Very curious to hear how this goes for you and if there are any noticeable differences.
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#5 Old 04-20-2017
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Hi,
Yes I will post a full update once it's completed. I have had to leave the car there overnight as they didn't get it finished today. The guy I have been dealing with has got a 350SLK and has done the same thing on his car. They have also done the on a number of SLKs and SLs.
It should give a nicer exhaust note on acceleration but not too droning in normal driving. It also makes the car more responsive to the throttle. So we shall see...


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#6 Old 04-22-2017
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Originally Posted by waylander View Post
As it says on the tin, is anyone in the UK planning on ripping out their secondary cats in the not too distant future? I may be interested in saving you a trip to the local dump
Hi,
I've had the work done, but it looks like the secondary cats are actually just resonators. I've attached a picture. You are still welcome to them if you still want them.
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#7 Old 04-22-2017
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Originally Posted by GeoffEff View Post
Very curious to hear how this goes for you and if there are any noticeable differences.
Hi Geoff,
Well the difference is quite subtle. The exhaust note is deeper on acceleration and the car feels a bit more responsive. The original x-pipe has been replaced and moved further forward in place of where the secondary cats / resonators were. If you see my other post it looks like mine were resonators. The x-pipe works better the further forward it is.
Under steady driving there is no real change to the exhaust sound which I think is a good thing.

Regards,

Andy
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#8 Old 06-01-2017
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Originally Posted by andybures View Post
Hi Geoff,
Well the difference is quite subtle. The exhaust note is deeper on acceleration and the car feels a bit more responsive. The original x-pipe has been replaced and moved further forward in place of where the secondary cats / resonators were. If you see my other post it looks like mine were resonators. The x-pipe works better the further forward it is.
Under steady driving there is no real change to the exhaust sound which I think is a good thing.

Regards,

Andy

If you could post a video on youtube so I can know what this sounds like I would be incredibly appreciative.
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#9 Old 06-03-2017
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Originally Posted by Oxnerkid View Post
If you could post a video on youtube so I can know what this sounds like I would be incredibly appreciative.
Hi,
I've taken this video clip of the exhaust note with the car idling and blipping the throttle. Apologies for the quality, you may need to use a reasonable set of speakers to hear the lower tones. I will take another of the sound while driving if can get a reasonable result with my video camera.

https://youtu.be/If3UmG0ocB8
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#10 Old 06-03-2017
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Can believe a second cat is a resonator. A cat relies on a high exhaust temperature (believe is above 600 F ) to work & the first one will cool the gas significantly. For that matter the second set of O2 sensors are not supposed to read anything when everything is operating properly, just sit at midpoint. Could probably replace with a pair of resistors.


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#11 Old 06-08-2017
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Quote:
Originally Posted by andybures View Post
Hi,
I've taken this video clip of the exhaust note with the car idling and blipping the throttle. Apologies for the quality, you may need to use a reasonable set of speakers to hear the lower tones. I will take another of the sound while driving if can get a reasonable result with my video camera.

https://youtu.be/If3UmG0ocB8

Idle noise sounds pretty good. Definitely let me know when you can get a video under load.
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