Built a Custom downpipe and exhaust system for i4

[Gcc91]

Hi,
New here just finished fabricating a custom exhaust as weren't many options for a bit of fun.
Going to put on dyno this week and attempt a tune. Anyone had any luck?

 

[cyanmauve]

Cool! No muffler? How loud is it?

 

[patrickramdial]

Bro, that looks so clean. And sounds great also!

 

[Andy H]

Nice work. Does that bypass the valves too? Are you getting any drone at highway speeds?

 

[kitkat]

Nice work. Does that bypass the valves too? Are you getting any drone at highway speeds?

There doesn't seem to be a muffler to bypass

 

[Nova]

I see a flame at 8 seconds into the video.

 

[Dragoon]

It looks like you also have some nice weight savings! Sounds great!

 

[seriously]

surprised how good it sounds. I would have guessed it to be over the top loud.

 

[Gcc91]

Cool! No muffler? How loud is it?

It's loud haha

 

[Gcc91]

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

 

[crashprash]

Wonder what a design like this would sound like on a v6

 

[Gcc91]

Wonder what a design like this would sound like on a v6

Would sound amazing I think. Yet it may require more back pressure been supercharged. Turbo spins better without back pressure. Little different

 

[lynchy73]

Hi,
New here just finished fabricating a custom exhaust as weren't many options for a bit of fun.
Going to put on dyno this week and attempt a tune. Anyone had any luck?
View attachment 53341

How are you gonna tune it? I didn’t think there were many options on tuning the AMG ECU?

 

[Porter]

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.

 

[Gcc91]

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.

 

[lynchy73]

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.

 

[Wusah]

That sounds great!

 

[RaynesCars]

The tunning company lm using is remotely accessing while I'm on dyno tomorrow. Will keep you updated if we have any luck.

Assuming they hit a stumbling black?