RMW Street Header

[JumpingJackFlash]

So I've slowly been hearing a rattle from underneath the past few weeks. It occurs at idle cold, then it occurs around 1500-2000 RPM warmed up. Put my MINI on the lift today, and my pal said it's coming from the catalytic converter.

Now... I can find OEM manifolds on the German E-Bay all day long for €100-150. It seems they are the same part whether it's an R50, R52, or R53 (of course, left-hand drive). I'm OK with getting one for now. But I'm also considering an RMW street header. The plan was to get one later anyway whenever I got around to ordering a new motor.

And considering... does anyone have a used street header for sale, or knows someone willing to part with one? I see I missed a header for $400 in the For Sale section by about five months. The next question is... will I need to get another tune done? You can see my mods in my signature; I already have an RMW tune. I am also reading about spacers and CEL codes, for which I am under the impression they have been remedied by now. Germans have zero tolerance for engine lights and will fail you at inspection if any of them are on (i.e. CEL, ABS, airbag). And I have an A/F gauge (though it's a narrow band, I still want the provision for whenever I get around to changing it out), so I will have to weld in an extra bung.

Thanks for your help.