I have a 2000 323ci with 135,000 miles on it and have done a lot of mods to the suspension but have never really done anything for the power except for a Simota CAI with a K&N filter. Today, I installed a Shark Injector and I am really impressed. The car feels much smoother and the engine seems to work it's way through the band quicker and I truly notice a feel in power. I realize you gain a lot more power through supercharging/turbocharging, but for anyone who is on the fence about buying a Shark Injector for an older 323 and don't want to invest thousands into forced induction/turbos, in my opinion, the $350 spent on the Shark Injector will no disappoint you. I have had this car for 7 years and and feel cheated for not doing this sooner.