Depends on what you want to do, lowered, Yes for dragracing, the lower the better. It has been said about .10 off the quarter for every inch lowered. Tire, many say a 180 turns better, my opinion its more of what tire brand than 180/190. I have a 180 on mine right now and dont care for the look, looks very skinny on there, but hooks up good at the strip cause its a Supercorsa Supersoft.