Got convinced into making the lid out of GRP (fibreglass) and adding abit more room above the trumpets
First real attempt of doing any thing out of GRP and its suprising easy to get good results, put 3 layers on (~3mm thk) which gives a bit of margine to fettle/smooth out the rough bits.
3 bags of sugar!! yikes Stu.
Yeah, i'm a composites man now myself! if in doubt, make it outta composites.
you could easily use the metal part as a patern from which to make a mould, in which to produce fibreglass parts you know!
(also, watch out for engine born vibrations, there is probably 50g or more of vibration on the intake manifold face, and with 3kg of airbox hanging 50cm out front you might find that it simply cracks up your manifold and TB's at high rpm!)
I was thinking that - use the metal fab to make a mould but, purely out of interest, would you make it up with the smooth face inside (for airflow) or outside (for asthetics)?
Good point about vibration...