hodroyd
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Interesting shots some of you may not have ever seen..??
Hi Robert, From the photo, your primary cats are part of the exhaust manifold rather than down-stream of them. It's common on the GS, but I wasn't aware this set up was on the UK 4200's, though your's is a facelift, so perhaps that makes sense.
Here's the Eurospares diagram, which lists it as the US / Canada variation...
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