Older S4 spareparts

Like to update my Audi S4 ym. 1991. I`ve been looking for rear exhaust and chassis kit (springs/shocks) but there seems to be quite little choices
I would appreciate if someone who has used those in their own S4, could recommend above mentioned parts. I`m not looking for something tailormade, but parts that have good quality/price ratio and have been designed to this particular model of Audi S4 (like ABT).
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