supercharger for 04 taco 3.4 different ???

noticed a lot of sellers for taco superchargers list up to "03" ... not sure where to buy or get the best deal on a supercharger/ 7th injector ???

w/o 7th $1899.00 with 7th $2949.00 Chris at trdparts4u.com out of Dallas.

i know the 7th injector keeps it from running lean but is it really needed

thank you for your response ...