I just got a 328I with sport and premium, some like to call it spremium, and I am wondering what I can add to my car to improve performance. I know I can get a chip installed, a better air filter, and get it super charged(that is too expensive though). Any recommendations for low cost improvements? One thing I've noticed is that (I have an automatic) it stays in first gear for 5 or 6 seconds before shifting whereas in my Mercedes E430 it's almost an 2 second interval. Is this slowing or speeding up my car because response doesn't seem that quick.