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SL55/63/65/R230 AMG: What pipe size for custom exhaust?

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Old 05-18-2009, 08:57 AM
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What pipe size for custom exhaust?
I wanted to do a full custom exhaust from the cats back. The OE diameter is 2.5in. How large can I go without clearance or heat issues? 3in? 3.5in?
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Old 05-18-2009, 09:43 AM
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what do you have 600 or 65?
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Old 05-18-2009, 09:56 AM
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600. Note the tunnel is the same. Hence the max size is the same.
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Old 05-18-2009, 10:01 AM
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Anything over 3" is overkill, I have 3" mandrel bent from turbos back, make sure whatever mufflers you use have 3" outlets as well
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Old 05-18-2009, 10:30 AM
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What did you do for your cats?
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Old 05-18-2009, 11:27 AM
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Originally Posted by Auraraptor
What did you do for your cats?
no cats
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Old 05-18-2009, 12:51 PM
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Out of curiousity, how about the SL 55, what size diameter piping for custom exhaust is best for the V8k engine?
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Old 05-18-2009, 12:53 PM
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Awesome! How did you not get a check engine light?
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Old 05-18-2009, 01:33 PM
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Originally Posted by Auraraptor
Awesome! How did you not get a check engine light?
Oh its there, I just ignore it...its just a light.
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Old 05-18-2009, 01:45 PM
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I would never pass inspection with a light. (lack of a cat is less an issue)
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Old 05-18-2009, 02:01 PM
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Originally Posted by Auraraptor
I would never pass inspection with a light. (lack of a cat is less an issue)
get a code reader and you can clear it, it will stay cleared for about 20 minutes, then go thru inspection
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Old 05-18-2009, 02:09 PM
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Good idea!

How about the dummy 02 sensors?
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Old 05-18-2009, 02:13 PM
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Originally Posted by Auraraptor
Good idea!

How about the dummy 02 sensors?
Those might work, but if you get a tune it coudl be programmed out permanently as well. Thye best idea is what Jayson mentioned, clear it with a scanner and you should be fine for a few mins...lol
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Old 05-18-2009, 02:29 PM
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Originally Posted by Sunir
Out of curiousity, how about the SL 55, what size diameter piping for custom exhaust is best for the V8k engine?
3"
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Old 05-18-2009, 03:54 PM
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Jay that's awesome stuff.. very cool. I think I'll go the same route.

I was measuring 3.5" right by the transmission on the stock exhaust, but 3" is perfect all the way through as you said.

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Old 05-18-2009, 03:59 PM
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I also wanted to ask, I think it's setup the same way on the W215.. around the diff the passenger side pipes get a little funky, did you have to do anything fancy with your custom pipe?



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Old 05-18-2009, 04:16 PM
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Originally Posted by Oxygen
Jay that's awesome stuff.. very cool. I think I'll go the same route.

I was measuring 3.5" right by the transmission on the stock exhaust, but 3" is perfect all the way through as you said.

This is the downpipe, I didnt change that, its not round its actually oval.
Originally Posted by Oxygen
I also wanted to ask, I think it's setup the same way on the W215.. around the diff the passenger side pipes get a little funky, did you have to do anything fancy with your custom pipe?



yes remove all of that shyt including the resonators...turbos dont need and "h pipe" so my pipes dont connect at all.

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Old 05-18-2009, 04:41 PM
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Jay that is beautiful man hats off to you

Was it tough getting the exhaust off the turbos?
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Old 05-18-2009, 05:00 PM
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Originally Posted by Oxygen
Jay that is beautiful man hats off to you

Was it tough getting the exhaust off the turbos?
extremely, the bolts are a biatch to get to
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