I've installed the following and I whole heartedly recommend this to everyone looking for a much tighter, precise feel.
Comptech Short Shifter
CorSport Online Store: Honda - 06+ Civic
Skunk2 Weighted Shift Knob
CorSport Online Store: 627990081
Corsport Cable Bushings
CorSport Online Store: Honda - 06+ Civic - CSU_HONCB
TWM Shifter Base Bushings
TWM Performance Shifter Bushings
I first started with the Comptech Short Shifter, and I immediately noticed an improved feel. The throw was drastically reduced and my whet my appetite for further mods. This is the length of the throw that should have come from the factory.
I obtained a Skunk2 shift knob, and that worked just perfectly in conjunction with the short shifter. Throws seemed much easier and quicker. I really love the feel and shape of this shift knob. I still love the feel and shape of the stock knob too, but the added weight definitely made it easier to feel confident about fast shifts.
I heard about the corsport cable bushings and installed them. I felt much more connected to the transmission. It felt more mechanical. Much of the vagueness that was previously present was removed with this modification. I did notice that when the car was cold, shifts seemed to take a little more effort but this smoothed out as the temperature rose. It also got better as I drove a few more times, the bushings do break in just a little. Perhaps a bit of grease could help as well. This installation was much easier for me as I'd already removed the stock airbox when I installed my cold air intake.
Finally, I decided to take the plunge on the TWM base bushings. I was a little skeptical about what difference this would make at first, but the following explanation helped me understand their purpose a bit better:
"The base bushings solidify the shifter - for example if you push on the shifter when it's in 1st gear you'll feel flex from the rubber base bushings. When you replace them with our base bushings this is eliminated."
This is completely accurate. I notice the shifts seem nearly effortless now, much more fluid. It is as if by securing the shift lever, I've eliminated all stiffness that the Corsport bushings had seemingly introduced. In all fairness, the Corsport bushings only introduced a bit of stiffness because of the stock shifter bushings. I believe this is because the rubber bushings were a bit squishy and would compress a bit first before the shift rods move. Now, the shifter is firmly planted so any motion you make with the shifter translates directly and instantly to the linkage. This wasn't a difficult install, but it was a little tricky simply trying to position the base bushings in place before bolting the shifter back down again. I do recommend you get some sticky tack to place on the top of the bushings so they can stay attached to the shifter as you're placing the other bushings in place, otherwise this would be very difficult and could take you far more time than necessary. Took me 20 minutes, taking my time and using sticky tack.
If you are going to do the bushings, do yourself a huge favour and get both the base bushings and the cable bushings.
Oh, and I recommend one of these as well
06/07 Civic SI Shift Boots
Update:
I changed out my transmission fluid to the new Honda MTF to fix the slight grinds I've felt when shifting from 2nd -> 3rd. I've noticed the shifts feel smoother, and I haven't felt anything grind since. There is an occasional bit of notchiness but nothing to worry about. I used the following DIY's instructions to help me out.
DIY: Changing Manual Transmission Fluid - 8th Generation Honda Civic Forum
Canadian owners can obtain the Suction Grease Gun from Canadian Tire (part #28-2620-8) for $19.99.
Canadian Tire
US owners look here (Thanks to Janizary!).
YA745A, Gun, Oil Suction, 20 oz. Capacity (The expensive snapon tools version)
Plews Suction Gun
http://www.etoolcart.com/browseprodu...n-ATD5004.HTML