c63 amg sounds valved until 2.5k rpm's
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2015 C63 AMG w204 coupe
c63 amg sounds valved until 2.5k rpm's
Hello, I have a 2015 c63 AMG w204 coupe with weistec longtube headers, x pipe, and midpipe, and renntech stage2 tune
when I'm driving normally under 2500 rpm's it sounds a bit quiet for being full catless headers, but when it creeps up to 2500 rpm's i hear a steep increase in volume as it sounds like some valves have been opened.
Is this normal ? or what could be causing this, and how could I resolve this "issue"
I will try to get a video of this tomorrow and show you.
Thank you
when I'm driving normally under 2500 rpm's it sounds a bit quiet for being full catless headers, but when it creeps up to 2500 rpm's i hear a steep increase in volume as it sounds like some valves have been opened.
Is this normal ? or what could be causing this, and how could I resolve this "issue"
I will try to get a video of this tomorrow and show you.
Thank you
Thread Starter
Newbie
Joined: Jun 2021
Posts: 2
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2015 C63 AMG w204 coupe
Thank you guys
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2007 Mercedes E63 AMG
if you don't like noise...best you don't reach out for one of my tunes then. 
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2010 C63 AMG
This would be my guess, cams going up on lift/duration can affect the exhaust tone/volume fairly considerably. Intake shouldn’t make that much of an exhaust difference.
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10 C six trizzle
lift and duration are not changing this isn't vtec. Only Lobe separation angle is changing with camshaft timing. Definitely something that could change tone, but intake flaps do make a huge difference in a NA motor. Mostly what you hear in a stock car, especially noticeable in a none AMG Mercs with stock exhaust.
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2010 C63 AMG
No it’s the same basic system an adjust moved the cam to allow the effective lift and duration to change. Yes the m156 doesn’t have 2 separate cam profile like vtec but it slides the cams to reduce the cam overlap as you increase throttle and rpm. At part throttle and low rom you have both intake and exhaust valves open to help with fuel economy and pumping losses. As you increase throttle this overlap is reduced. Still standing by my hunch it’s this and not an intake which if I remember correctly doesn’t change to the shorter runners until somewhere around 3500rpms
