Re: Advice, please - to chip or not to chip...?
Short answer = yes. Long answer = you actually want a "remap" not a chip, chips are the old way of doing things. Remaps are generally thought to be invisible to dealers and insurance companies. They DO improve both mpg and performance, this is because the ignition timing and fuel-air mix etc are adjusted to be more efficient, which gives you the extra power. The cars are mapped at the factory for any old crap petrol. Petrol here is quite high quality. For best results, run the car on super unleaded during and after the remap, the extra cost should be more than off set by the increase in mpgs.
And yes, if you want to maximise your increase, get a sport air filter (~£35), or full air induction kit (~£200-£300) and a stainless steel sports exhaust (~£500-800) before the remap.
Probably the most cost-effective (bhp per £ spent) would be the air induction plus a remap. Ideally you want air induction, sport exhaust and remap, but the exhaust does cost more than the other two. Also I don't know if anyone has created a bespoke induction kit for the 3.2. The generic induction kits you can get for any car wll make the car sound better, but you may see little or no actual bhp gain.
If you want to know more there's tons in the Tuning section of this website.
Brat Pack no.8