Here are some links I’ve found to useful resources:

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Aston Martin Technical Info Website

Aston Martin Owners Club DB9 Forum

6SpeedOnline Aston Martin DB9 Forum

Facebook Aston Martin Owners Forum Group

PistonHeads Aston Martin Forum

Porterfield Brake Pads

Califronia DMV Smog Check History Lookup Tool

UK Dealer I get my AM Factory Parts from www.hwmastonmartin.co.uk