Decided to have a go at making a beefier version of these myself.
Opted for double sided 2mm sheet carbon for the fins - really wish the 5mm sheets weren't quite as expensive as I'd much prefer those.. the 2mm sheets tend to become a bit invisible at certain angles.
I might look into 3d printing and then carbon skinning the fins so that thicker versions can be achievable
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2015 435i - 401whp
Scorpion catless dp, VRSF 6.5" HD FMIC, MST V2 inlet, NGK 97506, MHD Stage 2+ 102, xHP Stage 3, M Performance Exhaust (modified for valved straight thru)