Hi guys, I thought you might be interested in one of two current projects on my Zed. The other one I'll post about when it has progressed a little further 
When I bought the car it had RPi mufflers fitted. A week later I was able to swap with a mate for his OEM exhausts and I can confidently say that I absolutely hated the RPi mufflers. Why anybody would want to live with that level of noise and drone, even if tracking the car regularly, is beyond me! Still, after a year of ownership I was feeling that the stock exhaust was just a bit too quiet - this wasn't helped by going on runs with some of my M Club mates and listening to their S54 and S65 engines sing!
So I'm fortunate to be mates with a couple of professional BMW technicians and was able to nab a pair of mufflers that came off an F12 M6 that had received an upgrade. These, coupled with some electronic exhaust flap actuators from an M4 (the actuators on the M6 mufflers are vacuum controlled) combine to make a perfect setup for the Z4M!
So here's how it fits:
Here we have all of the parts laid out:
With regards to the tips, I wanted something really cool and double walled but still appropriate for the age of the car. The standard chrome M Performance Exhaust tips are perfect but I couldn't justify spending AU$150 each on them, so I decided to machine my own. The outer is a piece of 3" polished stainless tube. Into the end is press-fit a custom made aluminium ring which provides the detail and a seat for the 2.5"inner pipe (the pipe which will be welded to the muffler). A set screw on the bottom near the rear of the exhaust tip will clamp everything in place (please ignore the temporary socket head screws):
This was supposed to be installed on Friday, but the exhaust shop was running behind schedule and knowing how perfect I want it they cancelled so they can dedicate the proper time to the project and not rush it. So we're rescheduled for the coming Wednesday!
I also custom designed a control board which monitors the sport button and send the signals to open and close the actuators. This wires quite nicely into the boot (trunk), with a wire threaded through the bulkhead and centre tunnel trim to the sport button. The cables to the actuators thread out through a grommet in the boot floor.
Can't wait to get this on and hear what it sounds like! Even better will the ability to have it quieter for normal driving and a bit louder when hanging with the guys
Hopefully I'll have an update on Wednesday!
When I bought the car it had RPi mufflers fitted. A week later I was able to swap with a mate for his OEM exhausts and I can confidently say that I absolutely hated the RPi mufflers. Why anybody would want to live with that level of noise and drone, even if tracking the car regularly, is beyond me! Still, after a year of ownership I was feeling that the stock exhaust was just a bit too quiet - this wasn't helped by going on runs with some of my M Club mates and listening to their S54 and S65 engines sing!
So I'm fortunate to be mates with a couple of professional BMW technicians and was able to nab a pair of mufflers that came off an F12 M6 that had received an upgrade. These, coupled with some electronic exhaust flap actuators from an M4 (the actuators on the M6 mufflers are vacuum controlled) combine to make a perfect setup for the Z4M!
So here's how it fits:
Here we have all of the parts laid out:
With regards to the tips, I wanted something really cool and double walled but still appropriate for the age of the car. The standard chrome M Performance Exhaust tips are perfect but I couldn't justify spending AU$150 each on them, so I decided to machine my own. The outer is a piece of 3" polished stainless tube. Into the end is press-fit a custom made aluminium ring which provides the detail and a seat for the 2.5"inner pipe (the pipe which will be welded to the muffler). A set screw on the bottom near the rear of the exhaust tip will clamp everything in place (please ignore the temporary socket head screws):
This was supposed to be installed on Friday, but the exhaust shop was running behind schedule and knowing how perfect I want it they cancelled so they can dedicate the proper time to the project and not rush it. So we're rescheduled for the coming Wednesday!
I also custom designed a control board which monitors the sport button and send the signals to open and close the actuators. This wires quite nicely into the boot (trunk), with a wire threaded through the bulkhead and centre tunnel trim to the sport button. The cables to the actuators thread out through a grommet in the boot floor.
Can't wait to get this on and hear what it sounds like! Even better will the ability to have it quieter for normal driving and a bit louder when hanging with the guys
Hopefully I'll have an update on Wednesday!
very bespoke system & look forward to seeing the end results 
