With the limited number of options I thought I'd try something different, so I sourced a new set of Scorpion decats for an E46 M3, knowing full well they wouldn't fit.
I sourced the Scorpion units for 3 reasons:
1. They are true 2.5" piping.
2. They are cheap.
3. They are stainless, and I already had a bit of 2.5" stainless in the garage.
So off came the stock cats, and a side to side comparison. As you can see, the E46 M3 decats are short by about 80mm, and the 3 bolt flanges are clocked slightly differently.
I chucked one of the pipes on the car just to check they wouldn't foul anything and as suspected, they clear fine.
So out came the chop saw.
I chopped the flange off between the o2 sensor and flange leaving me enough room to add in a small section of pipe to make up the shortfall. Please don't judge my tig welding, I am by no means a welder!
I repeated the process for the second pipe and bolted it all up, I don't have any pictures unfortunately.
The car now sounds like an E46 M3 with the classic rasp between 2-3K, which the Z4M never seemed to have.
I plan on whipping them back off the car and chopping out the fake Scorpion silencers and I'll replace them with a couple of Fabco silencers. I'll update the thread as and when I do that.
I used these silencers on my E46 M3, and they work great.
https://fabco.uk/product/stainless-steel-4-100mm-round-exhaust-silencer/?attribute_pa_diameter=2-5-63-5mm&attribute_pa_finish=brushed&attribute_pa_length=8-200mm
I sourced the Scorpion units for 3 reasons:
1. They are true 2.5" piping.
2. They are cheap.
3. They are stainless, and I already had a bit of 2.5" stainless in the garage.
So off came the stock cats, and a side to side comparison. As you can see, the E46 M3 decats are short by about 80mm, and the 3 bolt flanges are clocked slightly differently.
I chucked one of the pipes on the car just to check they wouldn't foul anything and as suspected, they clear fine.
So out came the chop saw.
I chopped the flange off between the o2 sensor and flange leaving me enough room to add in a small section of pipe to make up the shortfall. Please don't judge my tig welding, I am by no means a welder!
I repeated the process for the second pipe and bolted it all up, I don't have any pictures unfortunately.
The car now sounds like an E46 M3 with the classic rasp between 2-3K, which the Z4M never seemed to have.
I plan on whipping them back off the car and chopping out the fake Scorpion silencers and I'll replace them with a couple of Fabco silencers. I'll update the thread as and when I do that.
I used these silencers on my E46 M3, and they work great.
https://fabco.uk/product/stainless-steel-4-100mm-round-exhaust-silencer/?attribute_pa_diameter=2-5-63-5mm&attribute_pa_finish=brushed&attribute_pa_length=8-200mm
