Best bang for your buck horsepower mod has always got to be nitrous. So much for so cheap.

change your thermostat from 195 to 180 ,motor is colder and air will have more density
and put a little of octane in your tank you can go as high as 110% octane,the timing will get ahead in high rpm a little bit at the time .

CAI.........YES,
K&N air filter..........NO big NO, NOT on MAF cars! Oily residue sticks to MAF and you loose Horse Power!!!
Go with a AMSOil Air filter or even a OEM one for that matter! Stay away from K&N! :banghead:

NOS is a good bang for the buck. I'll second stang illusions about the K & N filters. Not a good idea on MAF sensored vehicles. If you want to go dirt cheap do a weight reduction.

Might question this one. I have an '06 GT and put in a tank of 92 Octane this summer. It ran terribly. Switched back to 87 the very next tank and ran smooth as a top. I don't have any extra mods or tunes on my car so maybe that makes a difference I am not sure but I will be running regular until I get a 93 Octane tune.

Yes Plotnik there are. See Steeda.ca. They aren't cheap but worth the money IMHO.

OK,

This is a load of crap. The ONLY time this is an issue is, after you clean the filter you over oil it. If you follow the instructions given with the cleaning kit to a 'T' you won't have this problem.

OK,

You COULD do this OR you could spend $10 on a bottle of Redline Water Wetter, pour it in your oerflow tank and achieve the same effect without the muss and fuss of swapping out a thermostat, unless it NEEDS to be changed.

Sorry bud but you need to do your research, most of everyone on here will tell you the same thing!
K&N Filters come factory with a oil coating, and using a larger displacment via 4.6, 5.0 etc... and with a larger Throttle body you sucking even more air, hell then there is forced induction via S/Cer/Turbo that wants to suck the air filter right in.
Regardless ANY oil residue on ANY filter is not good for a Mass Air Flow sensor, there is proof all over the internet people have done dyno runs, etc...
When I bought my car it was stock I cleaned the MAF and I actually felt the difference. :tup

Do more research and come back and let us know what your learned.

OK,

No matter what filter you use there comes a point when a MAF needs to be cleaned. Everyone I know who runs either NA or Supercharged or turbo cars run a K&N filter or similar. K&N themselves have been fighting this falicy and have said the same as noted above in my last post. If you don't like using them that's your choice, but don't trash it just because you personally don't like them.