an L6 would be good because it still can mantain good balance, but be a little bigger and make decent power with decent torque.. if honda made a 2.8 litre L6 it'd have a NICE 336 hp (assuming they could get the 120hp/litre).

the 4 banger it has provides anemic power. 240 hp 150 tq.? im a honda proponent.. but 150 tq. good god. the s2k is a light car so it doesn't need gobs of power to make it go.. but i think it'd be sweet with about 100 more tq. and 40 or so more HP.IMO. id rather roll around with 287hp and 280ish tq. although even that's not all that great. modded 350z's (non FI) have kept up with me, not to say my car is fast but that VQ is doing something right.