If you are definitely Turbo-ing your Tezza then you should not get a final drive of 4.5 as you would be flying through the gears .... it would make more sense for you to try and source a lower ratio final drive like in the IS300 (3.5-ish) so that you can stay in gear ( and boost) longer.....just my humble opinion , correct me if i'm wrong
no ive been hearing that a good bit . tis why i asked if i was been fobbed off . but only getting told that i should keep it standard