Originally Posted by Paulg443
- headers ( port/polish )
I'm not sure you understand what a port and polish is.
Whatever you're looking for (power, MPG, etc)...you'll probably get better results from a tune-up and/or replacing worn engine parts than any and all bolt-on "mods" combined.
The typical "this-will-gain-you-20-horsepower" intake, headers, and exhaust, will not in fact get you any gains. You may possibly be able to get a few horsepower (like 2-3) from a re-tune. You can add bolt-on mods, then get your ECU tuned to compensate for the additional air and fuel flow, and that can help.