1NR-FE...anything at all that can give it more grunt?

[Dudefinch]

Hey, my Audi S3 got stolen last week, so it's a bit of a shock to go to driving my wife's 2010 Yaris 1.33 around. I've read a few forums that say don't bother doing anything, but would I notice -

opening up the airbox / better air filter
new spark plugs
....I don't know....anything not too expensive?

We did buy it to be reliable so it is doing it's job, but...such a slug

[Dudefinch]

Oh btw, I've already opened up the exhaust a little by letting the rear muffler rust itself off till it fell off. Sounds much better now, although have not noticed any gains :-D

[mitch9521]

Nobody to my knowledge even bothers to modify the NR series.