It will almost certainly fit as the 406 had the same air filter box and element for all models across the range from 2000 on. Petrol, diesel, 4cyl or 6 cyl I think it will fit.
Whether you'll gain much, if any, performance is debatable at best. In my opinion I think it will make no difference at all.
You might get a different sound from the induction system. Not a reason not to fit it, but I am of the opinion that quieter is always better.
If you want to get a bit more from the 2.0 90bhp unit then fit an intercooler and remap it taking the intercooler into consideration.
Hi mate. Celtic can be buggers to get hold of, I agree. However, their work is of a stirling standard and they're very supportive. Graham and Tony are based in Newquay, North Cornwall.
If your is the 2.0 110bhp they'll get about 150 I think. The torque increase is what makes it so special though. You'll be staggered how much smoother the whole driving experience is.
