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Curious to know if your wonderful X-pipe w/o cats is still available. I installed one of your X-overs on an '88 S4 (with cats) shortly after they became available several years ago. It was beautifully crafted and made a noticeable difference to that car's performance.
This time around, the application is a little different. I am using 85/86 manifolds on a 5.0 16V. As you are aware, the 16V heads put those manifold flanges in a different position from where they sit when mounted to 32V heads. I think you have offered an adapter for correcting this and I am hoping it, too, is still available.
The fuel injection for this "Euro hybrid" will be the stock L-jet system. I don't foresee any issue with compatibility between the o2 sensor from the L-jet to your X-pipe, but I welcome your insights.
Let me know if an X w/o cats and the adapter can still be had!