C63/C63S AMG
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Those with down pipes please post here

Old Jan 18, 2016 | 10:34 PM
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Those with down pipes please post here

I have the performance exhaust option. I've been doing some research on a tune and I keep running into posts about down pipes. I take my car once a year to Montreal (from NY) for the Canadian Grand Prix. Loved this trip in my CLS. If I'm considering down pipes should I be concerned about excessive drone at cruise speeds? Have a qualified shop that is happy to take on the install job almost out of enthusiasm for the build.

Will I regret the down pipes? I'd hate to have to yank them out because it's too annoying. Please chime in only if you have stock exhaust/performance exhaust option and down pipes. Not interested in any other exhaust options.

Ps: any local NY guys I can take a highway ride in for first hand impressions?
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Old Jan 19, 2016 | 02:50 PM
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I talked to a MBZ tuner at the track and he said it only adds about 5-7hp
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Old Jan 19, 2016 | 03:37 PM
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Originally Posted by AMG_Eric
I talked to a MBZ tuner at the track and he said it only adds about 5-7hp
Ha, uh what? Downpipes on this car will definitely add more than that.
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Old Jan 19, 2016 | 04:14 PM
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Originally Posted by PurpleHeartAMG
Ha, uh what? Downpipes on this car will definitely add more than that.
That is what Dieter Heinz Said from HG Motorsports in San Diego. https://www.hgmotorsports.com/produc...-gt-downpipes/

That is NOT including a tune.
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Old Jan 20, 2016 | 12:28 AM
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Old Jan 20, 2016 | 10:16 AM
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Proof is in the pudding !
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Old Jan 22, 2016 | 11:48 AM
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Think I'll just stick with a tune and invest in a custom set of wheels. I'm not going after fastest c63 honors and not really comfortable with the idea of removing the tranny to install down pipes. I'll be happy with 500+ whp.
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Old Jan 22, 2016 | 03:12 PM
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The graphs give a good idea but remember that they show the max increase at one point in the power band and not max HP increase.

Last edited by RDOCA; Jan 23, 2016 at 06:17 PM.
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Old Jan 22, 2016 | 04:21 PM
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It's clear the down pipes show hp and tq increase across the board but it's not enough for me to justify. I'm sure others on the forum would differ. Just my point of view.

Originally Posted by RDOCA
The graphs give a good idea but remember that they show the max increase at one point in the power band and not max HP increase.
Also because it is a M177 and not a C63S the torque increase is misleading as the GTS has less torque compared to the M178 in the C63S.
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Old Jan 23, 2016 | 09:22 PM
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Those graphs show DP with a tune. Let's see it without and with DP's only.
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Old Jan 24, 2016 | 01:13 AM
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Originally Posted by JPMBenz
Those graphs show DP with a tune. Let's see it without and with DP's only.
first shows without downpipes and second with
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Old Jan 24, 2016 | 07:36 PM
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Both graphs show it with a ECU tune...
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Old Jan 24, 2016 | 07:51 PM
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Originally Posted by JPMBenz
Both graphs show it with a ECU tune...
Of course they both have a tune and the only diff is the DP so you see what they contribute.
Most people won't do DP without a tune.
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Old Jan 26, 2016 | 11:57 AM
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Originally Posted by RDOCA
first shows without downpipes and second with
agreed. tune is everything. i can get 100+hp from the renntech tune or the brabus tune.
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Old Jan 26, 2016 | 12:12 PM
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Renntech site doesn't show anything for w205 c63 tune. Anyone have price?

I'd be happy with a 100whp gain from a tune. Think the Brabus tune is just too much $$$

Originally Posted by AMG_Eric
agreed. tune is everything. i can get 100+hp from the renntech tune or the brabus tune.
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Old Jan 26, 2016 | 07:54 PM
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Originally Posted by kc_amg
Renntech site doesn't show anything for w205 c63 tune. Anyone have price?

I'd be happy with a 100whp gain from a tune. Think the Brabus tune is just too much $$$
ECU Tune is $3500 from RENNtech please let me know and we can get you taken care of.
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Old Jan 26, 2016 | 09:56 PM
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U got pm
Originally Posted by James@ACGAutomotive
ECU Tune is $3500 from RENNtech please let me know and we can get you taken care of.
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Old Jan 26, 2016 | 10:06 PM
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A proper tune will definitely yield some very big gains. Downpipes will free up some power on the top end to improve peak power to redline. With a stock muffler, we don't find the drone to be overbearing by any means. The overrun snap crack and pop sure gets addicting though!

On our mcchip-DKR Software Optimization Stage 1 tune, we are seeing max gains of roughly +100-110hp and +85-90tq on the W205 C63. Comes with a very competitive price too! We'll be making a separate thread also once we collate all of our media and dyno data.


Last edited by Alex@PE; Jan 26, 2016 at 10:09 PM.
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Old Jan 26, 2016 | 10:35 PM
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Where are the east coast speed shops???
I'm in NY and this forum has little to no east coast presence.

Keep the good news coming. The more offerings the better. As enthusiasts we all have a different approach and preference. I'm happy to hear them all!

Originally Posted by Alex@PE
A proper tune will definitely yield some very big gains. Downpipes will free up some power on the top end to improve peak power to redline. With a stock muffler, we don't find the drone to be overbearing by any means. The overrun snap crack and pop sure gets addicting though!

On our mcchip-DKR Software Optimization Stage 1 tune, we are seeing max gains of roughly +100-110hp and +85-90tq on the W205 C63. Comes with a very competitive price too! We'll be making a separate thread also once we collate all of our media and dyno data.

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Old Jan 26, 2016 | 11:34 PM
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Originally Posted by kc_amg
Where are the east coast speed shops???
I'm in NY and this forum has little to no east coast presence.

Keep the good news coming. The more offerings the better. As enthusiasts we all have a different approach and preference. I'm happy to hear them all!
Definitely keep an eye out for some of the builds we're sharing across the whole forum in the different sections!

For the clients that don't mind a little down time and are not in IL, they have been shipping their ECUs to us for a full flash.

We'll do our best to continue sharing what we do here!
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Old Jan 28, 2016 | 01:20 PM
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I have had downpipes on both my C63 (204) and CLS63. I have dyno tested both cars with and without. The extra power is minimal to say the least and cannot be felt.
There were no drones on either car but the minute you step on it past 2.5RPM, you can hear the difference.
I did it more for sound and only because I got a deal on them. I refuse to pay the MB tax for a pair of bent pipes
A resonator delete is the best bang for the buck for sound purposes.
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Old Jan 28, 2016 | 11:02 PM
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Originally Posted by kc_amg
Where are the east coast speed shops???
I'm in NY and this forum has little to no east coast presence.

Keep the good news coming. The more offerings the better. As enthusiasts we all have a different approach and preference. I'm happy to hear them all!
+1 I'm in down the Jersey Shore area. Where is the love?! haha
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