I use an Iridium plug in the TTR, it can be a pig to start at times and with the Iridium plug it certainly fires up eaiser. But there is no noticable difference to a standard one. Given that there is no problem with the 660 motor firing up, I'd keep my money for other things.

Tripletom did some research to find a programable ECU, and I think (form failing memory) it was something like �2500. The stock Yamaha one isn't programable easily, although anything with software is vulnerable to being cracked, the costs would be silly and this could easily raise a bug in another area.

For the <�300 for a PowerCommander, combined with the DNS upgrades it offers very good value for money. You could spend �500 on cans with less improvement.

There is the Kev-Fuel-Mod that has some good feedback and very cheap. Basically this fools the bike into thinking it's colder than it is and adding a bit more fuel (with the DNS filters it runs too lean).

I have the DNS Stage 2 and PC-V with the map supplied by Simon - it works very well indeed and I'm very happy with the return on my investment (and if I ever get a newer Z, I can move it to the new bike!)

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Never underestimate the power of stupid people in large groups.