This list is about period correct companies / tuners / teams > upto ca 1990 and meant as a reference to search extra info to new / existing treads Tuners motorsport / street VW Motorsport Nothelle Dennert Abt, Misczyk Spiess Muller Veytal Oscar PS > Oskar Berg Schrick HOR / HOER Graf Hartmann Kilian Iresa / Oettinger / Okrasa Cresson RAS Sport Gruwi ( Wilke > ex Muller ) Zollner Konrad Schmidt > SMS GTI Engineering DR Tuning / Dhonth > Belgium Hohenester Bickel > Polo / Derby gr 2 / gr5 Visconti > UK Sorg > polo > might be later in period ? Dubois > Belgium Thiebaut > Belgium ( rollcages ) ROC > Annemasse France KWL WL Knobloch ( Polo ) Kassel, Germany GTI Engineering Autocaravan TSR - Tim Stiles Racing GMP Zollner Dupre Schroder Sorg Engines : Drake > USA Bertils > USA Zeitler > USA Oreste Berta > Argentina Judd / Engine devellopments / Brabham SV / F3 > UK Graf > 16V head > Heidegger Mader > now owned by Mecachrome Seymaz > F3 Lehmann Mike Callaghan Dupre ( Klaus) Cosworth > SuperVee MTK / Kolb RAS Huricane racing engines Schrick Ahnendorp B.A.S ( now only aircooled engines ) Ziegler and more street oriented tuning : Rinspeed Nordstadt Autotech > supercharger Ritter Sauer und Sohn Binder Mahag Callaway Sbarro Riechert Hinse Max Moritz Parts : Kamei Zender Koni Bilstein Sachs H&R springs Matter Heigo ( strut bars , roll cages )
Yet another blast from the past was Richard Hulin. He was a specialist motor engineer based in Cirencester.
What about C and R Stealth Dubwieser Dubsport or were they all post 90 my memory isn't as good as it used to be
Upto ca 1990 is maybe a bit to narrow, lets take upto ca 1997 / 1998 > Mk1, Mk2, Mk3 cars That allow above listed tuners in....