ye ha

i have a 99 rb5 i want to take it up a stage .it came from the factory with a ppp kit which means 240 horses.where do i go from here ? i hear the intake and exhaust are resricted .iv'e been advised some sort of ram intake ?what's the best to get the max cold air into the engine .boost controller ? de cat down pipe .i have a hayward and scott lined up for this .do i go as far as unequal headers at this stage theres a few at decent money what sort of horses could you expect for these mods .once fitted a remap would be on the cards .any advise would be gratefully on board cheers guys