none really that'll benefit you >_> Except really remove the plastic cover off the engine, probably make it rune 1 degree colder? a cheap mod would be getting a resistor and sticking it in the air flow sensor, thats all the air flow sensors are is resistors, if u get the right OHM resistor u can make ur car think its running a bit colder yet increase performance(Not much) But a little bit..
cut ur exhaust off??
lol joking >_> dont do that....
buy a memcal off ebay? when u say cheap >_> what do u mean by....cheap? like $2 cheap or $100 max cheap
welll for $200 max you can get an $80 k&n filter, i got one for 110 but its alot bigger then the 80 dollar ones, saved me about 25% fuel i worked out and got rid of all those flat spots at low revs and definitly gives you a bit more kick. no sure on the exact power increase but.