Yamaha Warrior 1700. How to modify Stock Exhaust. Глушитель, переделка

Look how you can modify the stock exhaust without a special tools and machines. You need skrewdriver, corded drill, cut off grinder, drill bits, extension bit holder, some small LED light and ... 6 hours for fun work :-) Here is a same result of sound and same muffler. But much-much more and to complicated process of work : Переделка глушителя мотоцикла.