Can anyone help with tyre pressures for 18" wheeels on a A6 1.9TDI 1997?

Just check the sidewall of the tire. It will have the recommended pressure. You can also check the manfacturers website.

OOOO

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Spec Stage II Clutch and Aluminum Flywheel, APR Software, APR Snub Mount, APR Downpipes and Test Pipes with Milltek Cat Back, Hyperboost Diverter Valves, K&N Drop In (Temp).

I understood the inflation pressure on the side of the tyre is the maximum operating pressure. Not the reccommended.

Refer to your manual or call a reputable tire shop in your area and tell them the size -- i.e 245 50 17 -- and they will be able to tell you.

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2001 Audi A6 4.2 Sport - Silver
2004 Lexus IS 300 SD - Black

Somewhere in the 36-42psi range should work pretty good.

really depends on the tire. I run 18" Michelin Pilot Sports on mine at 32psi.

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"Your Kung Fu is very good, but it's no match for the fury of my ancestors"

'03 A6 4.2 Sport/Lux 18's. Stock otherwise (except for Aftermkt. Floor mats which add 22HP)