I heard you don't need to remove the bumper to install chasis bars, but that you can go in through the bottom. 30 minutes to do the chasis bars, and like 20 minutes for the sway bar. No bumper removal.
http://www.nsxprime.com/forums/showthread.php?t=81503&highlight=chasis+bar+install
http://www.nsxprime.com/forums/showthread.php?t=37161&highlight=chasis
http://www.nsxprime.com/forums/showthread.php?s=&threadid=24233&highlight=typer+bar
btw need a Type R front swaybar??? I got one I need to sell.
my buddy owns a shop. He installed my front and rear sways on my NSX and did my tranny fluid change last night. His shop is in Daly City if you interested.
He also did some work on NSX Jombo's car. He mostly works on S2000's though.
let me know...His prices are pretty cheap
But like other mentioned, its a pretty easy install. Just make sure your endliks aren't leaking or rusted up. happened to me and I needed to buy new endlinks to do the install.
hope the new sway and type-r bars put a grin on your face