Thanks Dom for taking the time to reply with such an in-depth response.
I actualy did take the plunge & buy a new XR6 ECU thru Metro Ford in Bris (Exchange discount on my Gli ECU).
Difference ? - pretty much as you said - the auto changes on mid throttle are notchy but full throttle very positive, the car surges forward beautifully 1st - 2nd, 2nd-3rd especialy.
The change pattern is better, holds on each gear longer, extra 500 rpm realy geats the most out of the cam. It settled into the cam much quicker than the stnd one.
Fuel economy is better.
Power ? pretty sure it's up, maybe 5%, but stnd, permium or optimax make little difference.
Pick up mid range is just amazing. I can kick down while overtaking at say 95kph back to 3rd, it holds on at about 2/3 throttle and lets go at 160-170 kph into 4th, Incredible.
Top speed ? dunno, Pacific Hwy too dangerous, plus don't want arrest, fine, loss of license.
170 is the most iv'e gone breifly. Felt like nothing, still plenty of pull, asking for more.
A full throttle start & it revs to about 5600 - 5700 but not much after 5500.
I'm guessing the 0-100 figure may be 6.8-6.9sec too frightened of dissapointment !
Overall, driveability much better - in a car park, can get serious wheel spin both wheels & a cooll sideways drift.
Any tips for me ? You sound like you work for a dealer, what do you know about the Krogdahl twin cam head ? According to the website www.krogdahlheads.com.au
it's an 11 kw increase on the dyno at rear wheels, but bo 4 valves, no spark plugs at the centre, doesn't soung that good.
thanks again mate !!