'90 240sx... what to upgrade next?

[theboy419]

Hi, I'm sure this is common to be asked, but i have a 1990 240sx that I am looking to do a few minor upgrades to and was wondering if i can get some suggestions on atleast the following, anything else is appreciated:-suspension-tires-spark plugs(because I've been told my Bosch Platinum 4s are bad, any reason why that is?)-exhaust-brakes-headlight conversion (something non-flip up possibly?)

However, for the moment the first thing on the list is what needs done the most: suspension. Are there any recomendations? I don't really race or anything, but i have a lot of twisty, kinda rough roads that i drive on at times so i'm looking for a good suspension to replace whatever came w/ my car that is about shot now. I don't care for something over sporty, but would like something that rides nice but will handle some 90 degree turns i got comin at me ;-) anyway, so if ya have any suggestions, please let me know

[navysnail]

suspention: i use agx and sportlies righ now, i didnt like the sportlines because they are too soft and lower the car too much., so my stock susp. is back on.tires: zeroforum?id=140 look at the tire faq, its a sticky at the topspark plugs: NGKexhaust: BRM is what i have, nice tone, and i got the big resonator so its not loud. if you want to see pics, zeroforum?id=44 look at the sticky "new exhaust for the s13/s14" at the top. brakes: i have hawk HPS, very good for street use, can handle pretty high temps for performance driving, or autocross, etc...headlight conversion; they make them, but they are expensive. a search on that should bring up some possibilities.

i am going to be using suspention techniques springs because they are linear, and those will go on my current KYB AGX shocks, they are adjustable.