On 3/19/2021 at 6:18 PM, AK260 said:

Ooooh! That’s really nice work there! What did you use to get such a good finish / result?

Just progressively finer sand paper, I think I finished with 400 grit then 0000 fine steel wool, the power was good even without the trumpets so anything extra was a bonus but the intake sound was glorious.  I have no proof at all but I'm pretty sure the width of the trumpet affects the sound coming out.

Put some denticles on it.

https://www.researchgate.net/publication/323011115_Shark_skin-inspired_designs_that_improve_aerodynamic_performance

So here’s a question - what think ye wise ones about the 50mm fully radiused MSA trumpets? They look very good quality and I like the radius / small taper but do they perform well on the L6? Has anyone used them and noticed any differences in engine behaviour or performance?

OK, let me answer my own question! A kind Uk member who bought them but not installed, dropped them off the other day. They are radiused to just over 180 degrees so I’m not sure if you can say fully radiused as I have seen some made from a single billet and fully radiused.

They fit is 99% perfect to under 0.5mm difference between them and the carb mouths.

They do look good quality. I have yet to do a back to back performance test, so more to come!