Just finished on my 2004 pre LCi model 530i 6 speed manual. I used oem parts such as the sport switch and tray. I didn't notice any steering wheel affect, heavier or anything else (probably because i am lacking a servotronic) but the throttle response is noticeable more responsive than before like installing a sprint booster!!! Connections are the same as in first page mentioned for pre LCI cars. I have M5 cluster instruments so no "SPORT" indication there just the light of the switch goes on when you press the switch.

http://i58.tinypic.com/of91ua.jpg

I also have M5 cluster...."Sport" is there....and special light effect

Just did this to my 2003 E60 520i and the steering hasn´t changed but the throttle response is a lot crisper, however , the revs take a lot longer to drop. Downshifts are ok but upshifts are jerky. This only happens when I activate the Sport mode otherwise I´d be under the bonnet looking for vacuum leaks. Anybody got any ideas??

i have an LCI with sport trans, i have the sport button already,

is this the same thing?

Yes.

Please help
 

So I followed the steps and instead of seeing just one plug that I have to unplug and connect the cord too, I see these 3 on the bottom and one on top and don't know which to plug the switch into? Anyone that has had this please help!

2008 535i
US car

Thanks!

Edit: figured it out.

After reading all the reviews, i've decided to perform this mod. I watched roskinc's vid on how to install and used 22 gauge wire, female crimp-on tabs, heat shrink tube, and a momentary push button that i bought at radio shack. very simple install
Overall I'm happy with this mod, seems bizarre to me that it's a hidden feature, anyway when sport mode engaged i noticed fairly dramatic improvements in throttle response(no need to buy a sprint booster anymore), steering stiffness, and gear ratio as stated by previous enthusiasts.
THANKS to OP for making this happen!
-07 pre-lci 550i

I can vouch for the install on pins 8 and 10. Worked exactly as the youtube install vid said. Makes a huge difference to a number of aspects. Very easy to install for anyone who has even a little bit of "un"-common sense.
So the car I brought that did not have sport mode option. Does now. Happy as. Cost? $2.00 for the switch.

nice ! weekend mod ! :)

One more question. Socket number 8 9 or 10. Which one i can is positive and negative if you want to mod my own LED.
Thanks