ahh, youve come to realize how spectacular this board is when it comes to responding to this kind of post. I dont know how you dont have a chip already, but thats what i'd do first. I have a chip, kn intake(with that debaffled airbox crap which was stupid btw), and triflo exhaust. A 525 is potent, but i have a 535, and the car just plain has too much weight to be a formidable racer, especially in stoplight drag races. The only time our cars shine is on the freeway at cruising speeds, as you'll see that is when your car picks up. I'd go for looks at this point, as 5's just have too much fat. only a v8 lets them go zoom zoom well. Im saving for an m5 engine after i get my suspension.
BTW after all the stuff I've done to my car, my hp is ~230, and tq~245, and i have a 5 speed. These cars just plain were not made to be quick.
1990 535i 5 Speed +[E.A.T. chip/Powerflow intake/Tri-flo exhaust system/Strut Tower Bar/Smoked Signals/Pioneer Head Unit/Crossfire vr401 amp/12" Crossfire BMF sub/eyebrows/18" alpina replica rims]+
6 cylinders, 5 Speeds, 4 Doors, 3 Pedals, 2 Exhaust Pipes, 1 Ultimate Drving Machine