
Originally Posted by
mbeige
If your aim is to get more performance, you're not doing a lot and frankly they're basically acting as a placebo.
However, if your aim is efficiency a better upgrade would be a tune up with the proper plugs and wires as well as timing checked and spark plug gap corrected, etc.
There has been reports that the cone air filters actually allow more air via larger pores, thereby allowing more dirt as well.
The sparkplug wires are already high tension (strong current passes through it). Replacing them if they're really old might be a good idea if you don't know when this was last done, together with the plugs and a tune up.
The strut bars only help when you really are pushing the car. It's just an extra thing you can do if you want, and if you find some cheap. Otherwise it might just change the handling slightly (adding a front strut bar might make it understeer more - or was it oversteer - somebody correct me on this). But this is usually only at the limit, not for daily driving.
So unless you take it to the track or might start adding more (eventually) I would just use the money on a tune up and getting the car as fresh as you can get.