What is the price of original stock exhaust?

You can click on the Link to see the prices of all spare parts of Yamaha YZF R15 V3. Moreover, for the exact prices, we'd suggest you walk into the nearest authorized service centre as they will be the better person to assist you. You can click on the following link to see the details of the nearest service centre and selecting your city accordingly - Service centre.

When I checked earlier this year it was around 6.5k for the BS4 V3

How much stock exhaust cost