Yeah you should be a 5 as it doesn't count modding lol you could put a V12 in yours and still be a 5 I guess...
Strange because on the below form mines a 4 as it's a 60 plate, but I ordered a
sticker for my travel in Germany and I got a 5
My car newly registered from:
31 December 1992 - Euro 1
1 January 1997 - Euro 2
1 January 2001 - Euro 3
1 January 2006 - Euro 4
1 January 2011 - Euro 5
1 September 2015 - Euro 6