Spill
(Oh and BF ftw - I'm told it sounds awesome on WOT when overtaking but can't hear it in the car
)
When I had my Milltek before the Blueflame system though I did like the fact that it sounded completely standard off boost but with a cheeky little rasp on WOT - the fitment issues just did my head in and I prefer the oval tip personally.
tbh it's six of one and half a dozen of another - all depends what you want from the system.