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You're wasteing your money with bolt ons. Save your money for real upgrades like heads, cams, intake, blower or turbo. I made the mistake of trying to go the bolt on route and you really can't make any good power that way and it just costs alot.
"Good power" all depends upon what you want or expect from the car. You'll never get to 350rwhp with simple bolt-ons, but you can improve the drivability of a car quite a bit with bolt-ons. Most of the bolt-ons will work well with, and probably even be necessary with, bigger mods.
Decide now how much power you want and have budget for. Then make a plan and stick to it. You DON'T have to do what others have done. It is your car and you should come up with your own plan for it.