Your search for "mk4 exhaust system" revealed the following:
Euro Sport Mk3 VR6 Turbo
Engine, turbo, etc…~290whp & ~280wtq @ 10psi Kinetic Motorsport turbo kit upgraded to stage 2 w/ custom air-water intercooler Rebuilt stock 2.8l engine with head gasket spacer 9.0:1 Ported upper & lower intake...
NEUSPEED Stainless Steel Cat-back Exhaust - VW Jetta Mk4 1.8T/ 2.0L/ VR6 without bumper cut-out
NEUSPEED Stainless Steel Cat-back Exhaust - VW Mk4 Golf / Beetle 1.8T/2.0L/VR6 with Bumper Cut-out