what are good mods to do ? my cousin has a 95 altima with the Ka24de in it obviously header exhaust CAI anything else to get some decent gains?

Uhh Start doing some research on ka24de replacement CAM's perhaps? Kinda expensive depending on what you decide to go with but hey, atleast you don't have to drop the engine necessarily. :P

http://www.nismoparts.com/catalog/?section=324

I guess just pick and choose what can work with a altima. I know the engines are not identical based on certain s13,14,etc. But none the less it does give you a foundation. A lot of firstgen altima aftermarket parts are somewhat hard to find but it's never impossible..

jwt ecu

u can pretty much do alot of mods to the KA motor...cams..headers..exhaust..bigger throttle boddy...injectors...fuel pump...turbo...it jus depends on how your money situation looks...i mean u have alot of options out there...it jus depends on what you wanna do...track or street...check out JGY...u can find some stuff there for your KA.