well yaar, I'll have to respectfully disagree. If u wanted to mod ur car, u should have bought a manual tranny, you never have full control over an auto car unless its a big fish like a BM or a merc.
and haha, are u sure u want to put 17"s or 18"s on this gli? I mean how exactly will this car move according to ur needs with those wheels?
ans last, man, its all about ur thinking, but IMO altis 6 speed hard top was a FAR BETTER choice if u spent 50k more. U could get airbags, interior panels, oem alloys, oem skirts, fogs, navigation, audio and the best of all, a 6 speed tranny with a far better fuel economy than this.
this car with a 4 speed AT is a complete disaster. U'll rice it up, no matter what u do. ain't gonna increase the performance in any useful way.