I have a 4.4 with sport suspension. I run 19" Diamaris in summer and 18" standard michies in winter. I run 34F, 32R with the 19's and 32 all around with the 18's. There is a bit of a difference with the 19's, but very minor in my opinion. I actully like the 19's better as I can feel the handling benefits. The only 20's I've ever driven were on a 4.8 - huge difference in ride (& also handling) - so much so that I told myself the 19's were as big as I want to go.