Last year I had a run out in Premier Power's F200 Tivct Sigma with Stuart and can only conclude it's an absolute beast! If you like the fizzy high rev pull of the 310R rather than the slightly softer pull of some Duratec installations than you really need to check it out. It's perfectly docile at low revs around town but pulls hard, revs like a buzz saw and OMG the noise is unbelievable! It's an amazing bit of engine building that also seems reliable as Stuart is often out and about in it at national meets and track days, frequently giving test drives to anyone interested. Definitely recommend a call to him.