In Reply to: Develop a plan posted by David on April 22, 1999 at 09:49:14:
: Sadly the mods you have installed do very little to increase your horsepower. You can install a JimC chip that will give you more low end torque and take advantage of a euro HFM. A throttle body will not give you much. If you want to increase HP in any real way then you should have saved the money you spent on this other stuff and put it into a turbo or supercharger. You should develop a rational enhancement plan before you go off buying mods in a scattered way. Talk with a local tunner or solicit more input before you make any more moves
The Euro HFM option is not available for 96+ M3's (I wish it were). Here is a rundown of some good power mods:
1) TMS (Jim C) ecu reprogramming & drop in K&N - makes a nice noticable difference, doesn't improve top end all that much, but really fattens the mid & low torque.
2) Underdrive pulley, I hear this makes a nice difference across the board, something on the order of 8-10 rwhp!
3) Lightened flywheel, really makes a big difference in the first three gears, but it is a bit expensive, especially if someone else installs it.
4) Most cat back exhaust systems do not improve hp over the stock exhaust, but an aftermarket exhaust combined with your headers may make a difference. Not sure about that one...
5) The best way to make your car FAST is forced induction. Period. Unfortunately the AA turbo kits are not available for true OBD-II (I think the $15,000 setup for 96+ cars converts them to OBD-I). Mechtech has one, but it uses a variable fuel pressure regulator, instead of a reprogrammed ECU and larger injectors (much better, safer, and more elegant solution IMHO). Unless someone comes out with a positive displacement type supercharger, the supercharger kits for the M3 are centrifugal, which means no big power until 4000+ rpm.