Well I got the viper induction kit and took a nice run from York to Manchester Airport, once the ECU worked out how to compensate for the extra air I started to notice the change.
You can feel the engine rev and breath a lot more, the red line comes quicker too, I was in 5th doing about 70ish and changed down, the pick up is much quicker and it pulls even harder than before but still keeps that smooth 24 valve V6 eticate.
NOTE this is a pig of a kit to kit, piper cross say it is a universal fitting kit but the instructions would have you think some thing else.
There was quite a bit of traffic so a real test will need to be done soon.
I am happy to have my ZS180 and feel it will be the car to have in its class, and the goodies to come as extra BHP will keep most happy for years to come.