LHT is the only company i've heard of that makes an intercooler for the jrsc for the b series. intercooling with any FI setup is always a good idea. the intake temps can get pretty hot.

you'll want to go with a walbro 255lb fuel pump, intake of your choice, kamikazee header with 2.5" collector and matching 2.5" exhaust.

lsd's were an option on the jdm gsr but not usdm gsr. quaife is one of the best and the price shows it. you can get an oem itr lsd for pretty cheap though.

although i and many others will tell you sc's suck on honda's. you're better off going with a small turbo and conservative boost if you want to go FI and retain some of the characteristics of a sc.