Dear all E34 Sifu's,HELP PLEASE!!!I thinking to re-build my engine to make it more fuel efficient and powerful. Currently, the car is so sluggish and .with FULL 80 liters i get only MAX...350km with gentle accelerationHas anyone done the re-building before? which workshop and what is the estimate damage on pocket...Or plug in a M50 525 24V with Single Vanos. Which make more sense....Gearbox problem:1) the gearstick is HOT after driving for 5-10 minutes!!! it this normal2) Gear engaged - loud knock sound and can fell the ....i don't know how to put it in word..sigh!!!3) When turning to left, there are this funny sound coming from the back...it sound like...whomp whomp.....whomp...sighhh...