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A lot of people seem to go for the prodrive sports cat, it's 100 cell, apparently passes mot if nicely warmed up! I've got one ready to fit but waiting till I can afford the remap, not wise to fit it without! (also going for sti uppipe to avoid the cat breaking up into the turbo
My old MY05 PPP'd STI passed mot twice in my ownership
Warmed up - all I did was drive about 14 miles to the MOT centre at legal speed
Once I got there it was turned off for maybe 10 minutes until it was my turn.