Built a Custom downpipe and exhaust system for i4

Nice work. Does that bypass the valves too? Are you getting any drone at highway speeds?
 
It looks like you also have some nice weight savings! Sounds great!
 
Nice work. Does that bypass the valves too? Are you getting any drone at highway speeds?
I haven't had a decent drive yet thought it might throw itself into limp mode with the o2 sensors and egt in downpipe not having any difference in pressure. Will be putting computer on it this week and will have some more updates
 
surprised how good it sounds. I would have guessed it to be over the top loud.
Rotary mufflers are quite effective at lowering the total volume level of a modern engine. Surprisingly so in some applications, this one included.
 
How are you gonna tune it? I didn’t think there were many options on tuning the AMG ECU?
The tunning company lm using is remotely accessing while I'm on dyno tomorrow. Will keep you updated if we have any luck.
 
The tunning company lm using is remotely accessing while I'm on dyno tomorrow. Will keep you updated if we have any luck.
Great. I did find some info regards tuning these AMG motors. I believe you need to fit a “virgin ECM” to tune them beyond a certain point.
 

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