I have just acquired a 1998 A4 2.8 V6 30 valve and am enjoying it big time. Have already put on a Powerflow stainless free-flow exhaust (off with the cats! -legal in South Africa), and am putting on a Simota cone this week-end. I will retain the airflow sensor on its plastic tube housing within the new assembly, and am welding a stainless steel flange with 76mm tube for the cone to go on. Any further advice or warnings out there? Regards, Rob Jacobs, Cape Town