Audi S1 – Professionally Built One-Off | Golf R CJX Conversion | 400 hp This is a rare and exceptionally well-executed Audi S1, professionally converted to Golf R CJX power as a collaboration between Indigo Motorsport and MRC Tuning. Built with longevity and drivability in mind, this is a discreet, high-performance car for an enthusiast who values engineering quality over attention-seeking modifications. The CJX Golf R engine has been fully rebuilt to a very high standard, using forged pistons along with new gaskets, bearings and core plugs. The cylinder head has been skimmed, with bores honed and polished, and uprated large-journal crank bearings fitted. All work was carried out professionally, with photographic and video documentation available. The car produces approximately 400 hp and close to 600 Nm of torque, with the calibration completed by MRC Tuning. Over £7,000 has been invested with MRC alone, alongside a further £10,000 spent at Indigo Motorsport, all supported by invoices. Recent work completed by MRC (September): • Brand new IS38 turbocharger (with warranty) • New ignition coils and injectors • New water pump and housing • Airtek Stage 3 intercooler • Custom stainless-steel downpipe • Milltek non-resonated cat-back exhaust with quad tips • Sachs clutch and flywheel The car benefits from a ceramic coating applied nine years ago, helping preserve the finish, and presents in excellent condition throughout. • Only 55,000 miles • Two previous owners • Extensive service history • Over £20,000 in receipts • All work documented and professionally carried out This is not a typical modified car. It is a thoughtfully engineered, rare Audi S1 that combines subtle appearance with serious performance, making it an ideal all-weather enthusiast’s car or refined winter performance vehicle.