Guru Designs

Wassup. i did go thru the FAQ's and i am still a bit lost. I bought my teg last year 94 gsr w/pr4-4 head Dc headers tanabe cat back aem fuel rail with regulator with type r intake mani with a p72 ecu. Ok now i want to supercharge my car b/c i dont want to loose my A/C. now i was reading up on JR website and they said that the Gsr and type r/b16 supercharger is diffrent. i suspect i should get a b16/type r but im not sure. Also i was reading up on the water injection get but im lost due to the fact that i dont understand how it works. Should i upgrade stock injectors or just go with a higher volume fuel pump or both. I know i need to change my ecu due to the fact that the p72 uses secondary butterflies and the type r/ b16 are single runner intake mani. Will this be possible to do considering i only have about 2-3k to spend on this setup. Keepin in mind i run my fathers repair shop so i do pay for labor which will prodominantly(sp?) done by me. thanks in advance for your help