Build your own Custom Re-Amemiya 400g weighted shift knob, fits s4 also.
 

I posted this over in my build thread, but figured I'd post this up encase a larger audience was interested in a shift knob that will fit s4 or s5's.

I put together a custom Re-Amemiya shift knob, since I didnt want to spend around ~120-130 it would have costed from japan. The heavy shift knob feels great, and shifting is alot better.

Heres the original for comparison.
RE Amemiya - Carbon Shift Knob - 400g - Nengun Performance

The base knob that uses (Note: base knob is universal and fits all cars, the genuine RE knob says fits only s5+, fd,rx8 etc, so no idea if it is hard threaded.)

Then a custom resin badge from aus land, size 24mm. (Razo badge is around 24.5mm I rounded down to 24mm and it fits near perfect, with about zero play, if you wanted to play it safe you could go around 23.5mm)
http://www.ebay.com/itm/RE-AMEMIYA-ROTARY-BADGE-STICKER-DECAL-RX7-RX3-RX8-13B-/200801852030?pt=AU_Car_Parts_Accessories&hash=item2ec0b91a7e&vxp=mtr

End results:
https://scontent-a-dfw.xx.fbcdn.net/...02679784_n.jpg
https://scontent-a-dfw.xx.fbcdn.net/...48476103_n.jpg
Attachment 755895

Install is straight forward, just follow the razo directions. Has adapter size to fit s4 also, for all the s4 guys like me that have problems trying to find cool shift knobs.

Really awesome! I'll be doing this!

very, very nice. Quick question, do you noticed the difference with a lighter/heaver knob? I hadn't really considered it.

Yeah the heavier knob is easier to get into gear than the stock knob, the weight helps "throw" it in.

Sweet write up. Added to wish/watch lists.

Thanks! I'm liking it quite a bit so far.

Are you using a shorter shift lever also. Or is that the stock one

In the car pictured it is the stock Shifter. The razo knob has 3 different height settings.