Dowpipes usually nead replacing after the 100,000 miles mark. This is usaully due to worn engine mounts so in might be worth replacing these at the same time.
Mk1 Gti Downpipes
1.5 Carb 8/80 > 12/83 + Gasket
£32.19
GTI / GLI > 7/83 + Gasket
£44.18
GTI / GLI 8/83 > 12/83 + Gasket
£42.30
Mk2 Gti Downpipes
8v Carb + Gasket
£50.53
GTI 8/83 > 8/85 + Gasket
8v GTI 8v 8/85 > 10/91 + Gasket
£106.34
16v GTI /86 > 10/91 + Gasket
£269.99
Mk3 Gti Downpipes
VR6 95 > 97 + Gaskets
£159.99
Mk4 Golf Downpipes
Golf Bora 1.6 16v (ATN, AUS, AZD)
£99.99