This may have been cover I no nothing about spray like the affect to a motor ..puttin it in is no problem but effect are im considering it..but i need to know what the safest kit would be fore the rsx...and the biggest shot.....
Well the biggest shot probably wouldn't be the safest. A lot of people here probably agree that ZEX is safe due to its easy install but most of us run Nitrous Express. With a WOT Switch, RPM Window Switch, and master switches its pretty safe. The biggest shot that people have run is 125 i believe but im not positive. Im running a 50 right now with no problems at all and stock plugs. Im sure 75 would be no different either.
Before you do anything with it though, you gotta realize what kinda power you're wantin.
turbo = great power, constant wear and tear, shortened engine life.
n/a = very slow buildup of power, long lasting, most expensive.
n20 = power when you want it, no extra wear and tear when you don't, cheapest, gotta refill the bottle.
After that, read the stickes/FAQ at the top of this forum, and that'll give you a general idea of nitrous.