Why all the Questions
 

My car is currently getting R&R'd. I have a 1991 2.6L M103 I6.

Manual tranny from 190E sport line, conveted from AT
Custom lightened fly wheel, balanced with clutch assy.
Modified pressure plate contact pressure
diff gearing and Limited slip

Eibach Sports, Pro kit, all new mounts, all new bushings, and and steering tie rods, dampener, etc. new front end basically. rear too.

Brakes too, SS troutman lines, disks, pads

Time for the power plant, because like my compadres i am up in the air.

M103 or M104, turbo or N.A., costs benefit analysis, etc...

Any input appreciated. BTW the person building my car races a 190E in the ITS class in Florida. here is the link to race results.
Blew the ricies away even the rotor cars.

http://floridaregionscca.com/results/march23242002/SatR4.pdf
http://floridaregionscca.com/results/march23242002/SunR10.pdf