I don't know about aftermarket pre-manufactured fuel rails, I know you can buy fuel rail and a special drill bit and make your own.
The stock s5 fuel rail is pretty good.
Be careful of Stainless steel lines. If properly installed, they are Ok, but they have a nasty tendency to spring leaks at very inopportune times.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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