I have no idea whether it would work but you might want to ask on this supplier thread, The YiHi SX350 35W Chip at Varitube, or contact Varitube directly.
The 350 is longer than the 300, by I think about 10mm. You'd have to measure the available space in your sigelei to see if there's room. And you'd have to cut a hole for the USB, unless you want to disassemble it to upgrade the chip.
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