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I left mine in place when I did the plugs, D. It has been fine ever since.
One thing I would suggest is to clean up the valve at the start of the intake itself. Mine had a noticable ring of crap around the edges and I spent a good 10-15 mins cleaning it. I could have sworn that the throttle felt more responsive afterwards.....
Yeah mate you may as well invest in one as you'll never have to replace it again - as it happens I have a spare plenum gasket let over from a set at home - drop me a PM if your interested.