I just installed my cable 3 hours ago.
First remove the exhaust pipe.
Second remove the fire and ice intake
Third you can loosen the stock throttle cable and remove it.
Next loosen the clamps to remove the throttle bodies, unpluf the TPS, No I did not take off the y pipe. Removing it would have made it much easier but it only took me an extra 2 minutes of careful negotiation to remove the throttle bodies out the Mag side. And you can cut any of the stock throttle body to oiler assembly because you will NEVER need it again.
Next disconnect the cable from the oiler lever and be careful not to loose the c clip.
Open up your handlebar padding, remove the c clip just inside your throttle trigger to remove the cable and pull it all out.
Now just do everything in reverse and route the cable as you wish. Mine works great.