The scene has enjoyed variants of this one for YEARS. This 2.25" exhaust is made with mandrel bent aluminized tubing and uses a stainless Borla muffler with 12" Techtonics resonator. Gains of 7-8 HP are typical. Fits '85-'92 Mk2 Golf with 50mm catalytic converter. Clamps and rubber hangers included. Two year warranty on tubing and resonator and lifetime warranty on muffler.
For those that require the exhaust a bit quieter consider adding the optional second resonator and/or a venturi.