Hello, I am using Yamaha R15s form last 10 months and I need to change

Hello, I am using Yamaha R15s form last 10 months and I need to change the my bikes sound without changing the air-filter of bike is there any way, and the sound I need is not so loud and heavy I need smooth little loud sound I have seen K&N filter sound is very heavy and loud. I not need that sound.

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