I measured the stock diameter on my MY11 and it was exactly the same, but yes, as I said a few posts above, it still screwed up the maf readings Going for a Verso at the end of the month, so it's going back on then

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[CENTER]Car - [FONT=Verdana][COLOR=dimgray][B]MY11 WRX STI Spec R + Recaros [/B]- 284HP|394Nm|Ultrex 3"TBE|PW CAI[/COLOR][/FONT][/CENTER]
[CENTER]Bike - [COLOR=red][FONT=Verdana][B]MY10 Honda CBR1000RR Fireblade [/B]- 171HP|114Nm|Yoshi CF Slipon[/FONT][/COLOR][/CENTER]
[CENTER]My other passion - facebook.com/[FONT=Verdana][COLOR=dimgray][B]JamieWebsterPhotography[/B][/COLOR][/FONT][/CENTER]