I used high heat flat black paint on the steel cat bulb on the Storm (I think it is the same exhaust used on the Brozz and Recon, or was). I also drilled out the muffler to gain some flow. I definitely felt a horsepower or two gain, but more importantly, it revs easier and felt more peppy.
I have not tried to work with stainless steel yet.
https://www.chinariders.net/showthre...ighlight=storm
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-2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket
-NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it
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