well. i just got my f sport back from the dealer for 10 days. had them do some warranty work and had an chance to drive the new rx450h for an week and an half..

one of the things he mentioned was my tyres needs to be replaced.

Currently i'm running almost 30k on the Dunlop 050. the set that came with the car.. the ride is okay but not the greatest.

I'm thinking about replacing it with either an set of Michelin's Pilot super sport with possibility of running an size bigger. If not, should i go with an set of AS/3 or an set of Hankooks? The primary weather i'm seeing here is going to Norcal sunny weather.. sometimes in the triple digits. with rare occasion of rain.

i'm looking at 245/35/19 and 275/30/19 in the rear. with this set up, is it still okay? will i void the warranty if i go one size bigger than stock? Will it affect the speedometer?

another thing too, air filter. go OEM? or something else?