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Not really sure if it can be retrofitted to the 428. Looking at the realoem.com part image (18307645938) I see that the exhaust tube is 75mm instead of 80mm on the 435. One could get a tube coupling to fit, I'd imagine. The two parts look very similar in terms of how they mount.
428 exhaust: 18307645938
435 exhaust: 18307646997
I'd study the realoem.com part images before making a call, though.
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