the 150i kit is single point, the 150i2 i believe is twin point injection. the 150i kit is good for a 150bhp increment so i say thats all you need!
you MUST fit a grade cooler sparks for every 50bhp gain you add. i run a grade 7 plug rather than the stock grade 6.
if you want to go for more than 50hp you really aught to fit a bottle heater and you must fit a progressive controller. 50hp on my 1.8 is unreal tho and is a good balance between power and bottle life.
150i kit direct is about £600 delivered, for a 50 shot add another £12 for the larger jets. prog con is about £250 and heater about £150. at a 50shot you wouldnt need a controller or heater tho and believe me its great fun!
have a look at the other thread for some pictures of my install and a rolling road printout comparing with and without nitrous. making about a 40hp gain and an extra 50ftlb torque across the rev range and now running 5.1s to 60mph! thats from a 1.8 NA also
