NGK TR6 plug question
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NGK TR6 plug question
posting for a friend. He has an 02 WS6 A4. Full bolt-on with H&C, stall, and N2O. I've done some research and it seems that the NGK TR6 plugs are the way to go. Question is, where can I get them and what gap to set? Thanks for any advice or help anyone can give.