Turbo Kit for Volkswagen Golf GTI Jetta New Beetle MK4 1.8T 20V (1999-2005) 1.8L

Intercooled T3/T4 turbo kit for the 1999–2005 Volkswagen Golf, GTI, Jetta and New Beetle with the transverse 1.8L 20-valve turbo four (1.8T). It's built around a 321 stainless tubular T3 manifold, a hybrid T3/T4 turbo with an internal wastegate, a front-mount intercooler, a full oiling kit and a blow-off valve. A/C and power steering stay in place, and it works with manual or automatic transmissions. Expect roughly 100 hp over stock at a conservative 8 psi with a proper tune. The 485+ hp figure is the hardware's ceiling at 25+ psi with a built engine, fueling and supporting mods, not a dyno result for a stock car.

Why this kit

• TIG-welded 321 stainless tubular manifold with large primaries and a thick T3 flange that carries the turbo's weight
• T3/T4 hybrid turbo with a .57 trim compressor and .50 / .63 A/R housings
• Bolt-on internal wastegate preset to 8 psi, with V-band flange and clamp
• Front-mount aluminum intercooler and full 2.5" piping kit
• Braided -3AN oil feed, high-temp return line and billet adapter plate included

Package Includes

• (1) T3/T4 hybrid turbocharger, oil fitting gaskets and mounting studs
• (1) Stainless tubular turbo manifold, T3 flange, polished, with gaskets and hardware
• (1) Front-mount aluminum intercooler, 2.5" inlet / outlet
• (1) Internal wastegate kit, preset to 8 psi, V-band flange and clamp
• (1) Aluminum intercooler piping kit: (2) 2.5" straight pipes, (2) 90°, (2) 60°, (2) 45° bends, (2) 2.5" 90° silicone couplers, (6) 2.5" straight silicone couplers, (16) stainless worm-gear clamps
• (1) Turbo oiling kit: -3AN braided stainless oil feed line, 2 extra adapter fittings, CNC billet adapter plate, 18" 5/8" high-temp 550 psi oil return line, drain and feed gaskets
• (1) Blow-off valve kit with install kit

Turbocharger Specs

• Type: T3/T4 hybrid, wet-float bearings, balanced
• Compressor: .57 trim wheel, .50 A/R housing, 3" bellhorn inlet, 2" outlet
• Turbine: .63 A/R housing, T3 inlet flange, internal wastegate with V-band outlet
• Oil inlet: 1/8" NPT

Exact Fitment — Volkswagen

• 1999.5–2005 Golf / GTI (MK4) 1.8T
• 1999.5–2005 Jetta (MK4) 1.8T, sedan and wagon
• 1999–2005 New Beetle 1.8T (Turbo / Turbo S / GLS 1.8T)
• Transverse 1.8T 20V engines, e.g. AWD, AWW, AWP, ATW, AMU-family
• Not for 2.0L 8V, 1.9L TDI, VR6/R32, 2.5L or later 2.0T/1.8 TSI engines
• Not for the longitudinal Audi A4 / VW Passat 1.8T: different manifold and intercooler layout

Not Included

• Chassis-specific downpipe and exhaust beyond the turbo
• Larger injectors, fuel pump and ECU tune (required)
• Boost gauge, wideband and air filter
• Coolant lines if your setup needs water-cooled center section plumbing

Installation Notes

• Professional installation strongly recommended. The intercooler piping is universal, so expect some cutting and fitting
• Replace the stock K03/K04 turbo, manifold and side-mount intercoolers. Check bumper clearance for the front-mount
• Prime the turbo with oil before first start and check for leaks at feed and return
• Do not exceed the wastegate's 8 psi until fuel and tune are upgraded