Ceramic Coats

Have a look at websites,

http://compcoat.com.au/coatings.html

http://compcoat.com/

Same place...

Although I have not had work done here, my neighbour uses these guys for his Race Car exhausts.

There are other places that do Ceramic coatings too.

For your exhaust, less heat transfer, more horsepower, non-corrosive non-rusting finish.
The Ceramic coats inside and outside the pipe.

Looks great too.

Horsepower Math

Just a quick general section on Exhaust Sizes.

See the chart for chossing a diameter for your exhaust, although with bikes
you may not have much choice.

Acknowledgment from website
http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/

Keihin CVK - Needle Conversion Charts

These are just two re-posted Keihin Needle conversion charts that may be useful.

Thanks to the websites,
http://www.motorcyclecarbs.com/ , and,
http://www.jetsrus.com/ , for the charts.
Have a look at the sites for more info.

GPz900R - Keihin Info

Please see  http://gpzrear.blogspot.com.au/  for specific info on the GPz900R Kehin Carbs.