I HAVE A 1990 3.5L 735i, AND I WOULD LIKE TO KNOW HOW TO GET MORE POWER OUT OF THE ENGINE, BUT I DONT WANT TO JEPRODIZE THE FUEL ECONOMY. IT IS A WHIMP COMPARED TO MY PREVIOUS CAR (1988 750iL) AND I WANT TO BE ABLE TO TOUCH THE GAS AND GO. I ALREADY HAVE 18 INCH RIMS AND PERELLI P6000 TIRES.