Thanks Calum/RedThree,

I will look up the details for Matts Machine Shop.
I should mention that my M3W is a very early example (004) so I presume the exhaust & headers will be only 1mm thick - maybe this means the headers glow sooner?
By the way, love your M3W photos - brilliant
Andrew.

Currently
2011 M3W
986 3.2S
Z4 M40i
Cectek Estoc
Midget 1275
1959 Frogeye Sprite
2022 Defender 90 HT