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The stock exhaust diameter is 2 inches
2" diameter piping
18. 5" Length x 5" Diameter 2.5" inlet/ 4" outlet in diameter, 18.5" in length.
mine is a 2.745 on a digital micrometers
They came stock with a 15 inch diameter wheel with around a 4 to 5 inch width.
While stock diesel systems are very loud they are not the loudest type of exhaust you can get. To get an exhaust that is extremely loud you're going to need to go with the custom or bolt on route.
hollow out the muffler
what year 900 ninja exhaust? If you want stock exhaust for a 1984-1986 Kawasaki GPz900r then I know where you can get them new.
The first thing you can do is to change the stock exhaust system with an aftermarket exhaust system. In turn, you should fit a performance intake filter and either re-map the standard ECU or replace it, again with an aftermarket solution.
On a stock exhaust, there is one muffler and two tips
Stock Toyota exhaust system.
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