all depends on how much you want to spend, and how much noise you want... if you want something with some noise behind it and good performance gains, then the evoms is the way forward, if you want something a bit more subtle then the ITG max is the way forward!
for mapping, id personally recommend Evolve, thats whos done the mapping on mine and the car is electric
have a look through my build thread, ive listed all my mods and hows its changed the car with how its changed the power levels
No...mine was the standard single Forge....the Twintake gives about 15-17bhp over a stock intake and to be honest the ITG does about the same,so there isn't anything to choose from that point of view,and personally I prefer one large intake over two doing a similar job.
In short.....no.All of the high flow aftermarket systems require either the cover to be removed completely,or to chop the left side back to accomadate the new induction pipe.Things like the Carbonio etc are not going to be adequate if you want to go beyond Stg1,