MG While i agree with you on the pick up of a twinny, i must say the HGT has a more useable power delivery.
The lazy ness of it makes it for me a better engine to my style, as you have to work it to get it going. Ive had a few twinny alfas now and i was continiously buzzing around like a loon! (granted, a 155 silverstone does bring the BTCC driver in you a bit

)
Re the induction, for the 1.2 i really wouldnt bother spending big bucks, all it is is spending for spendings sake...
get a cheapie halfords cone filter and an elbow like Andy's above for noise, other than that just remove the resonator and blank the hole off.
I had a hell of alot of fun in my lil 1.2 as many on here can attest too

it made a bit of noise and wasnt really all that fast (the punto box helped shock a few HGT's mind with its pick up from LFE services on the way to Trax a few years back).
Have it how you want, as performance gains arent really there unless buyiong cams etc
Andy_sx