Turbo Kit for Mitsubishi Eclipse 420A (1995-1999) 2.0L

Complete stage 3 T3/T4 turbo kit for the 1995–1999 Mitsubishi Eclipse with the 2.0L 420A DOHC engine (2G RS and GS, non-turbo). It's built around a cast T3 manifold for the 420A head, a hybrid T3/T4 turbo with an internal wastegate, a front-mount intercooler and a full set of oiling, fuel and cooling parts. It does not fit the 2.0L 4G63 GS-T / GSX or the 2.4L Spyder GS. A tune and fueling upgrades are required.

Why this kit

• Cast T3 manifold for the 420A with large primaries and a thick, ported and polished flange
• T3/T4 hybrid turbo with a .57 trim compressor and .50 / .63 A/R housings, plus an internal wastegate preset to 8 psi
• Front-mount aluminum intercooler and a full 2.5" piping kit
• Includes the oil feed and return, a fuel pressure regulator with a filter, an oil catch can, a blow-off valve and a boost controller
• Battery relocation kit, slim fan and turbo timer free up room and protect the turbo

Package Includes

• (1) T3/T4 hybrid turbocharger, oil fitting gaskets and mounting studs
• (1) Cast turbo manifold, T3 flange
• (1) Front-mount aluminum intercooler
• (1) Internal wastegate kit, preset to 8 psi, with 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: oil feed line, high-temperature 550 psi oil return line, fittings, drain, gaskets and hardware
• (1) Manual boost controller with install kit
• (1) Blow-off valve kit
• (1) Fuel pressure regulator and -6AN billet inline filter kit with gauge
• (1) Oil catch can with install kit
• (1) Battery relocation kit (box, cables, straps, hardware)
• (1) Slim reversible cooling fan with mounting tabs
• (1) Electronic turbo timer with pigtail wiring
• (1) 38 mm aluminum coolant bung
• (1) 50 ft × 1" heat wrap
• (1) Cone air filter

Turbocharger Specs

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

Exact Fitment — Mitsubishi Eclipse

• 1995–1999 Eclipse (2G) RS and GS hatchback with the 2.0L DOHC 420A (non-turbo), plus the 1996–1997 base hatchback with the same engine
• Not for the 1995–1999 GS-T / GSX (2.0L 4G63T): see our Eclipse 4G63 turbo kit
• Not for the 1996–1999 Spyder GS (2.4L SOHC 4G64) or the 1990–1994 1G Eclipse
• Fits manual and automatic transmissions

Not Included

• A chassis-specific downpipe and exhaust after the turbo
• Larger injectors, an upgraded fuel pump and an ECU tune
• Oil pan drain bung welding or tapping
• A clutch upgrade
• Installation instructions

Installation Notes

• A tune is required. The 420A in the Eclipse came naturally aspirated, so it needs fuel and timing control before you run any boost.
• The intercooler piping is a universal 2.5" kit. Expect to cut, trim and route it to fit your car.
• The oil return needs a gravity drain into the pan, so plan to add a drain bung.
• The manifold is a street cast log, not equal-length tubular. It's strong and spools quickly, but it doesn't flow like a header at the top end.
• Blow-off valve flanges can be welded where you prefer.
• Use the turbo timer, or let the car idle for 30–60 seconds before shutdown.
• Expect about +100 hp on a healthy stock engine at 8 psi with a proper tune. The 495 hp figure is a hardware ceiling at 25+ psi with a built motor and supporting mods, not a dyno result.
• We recommend professional installation.

FAQs

Will this fit my Eclipse GS-T?
No. The GS-T and GSX use the 4G63T. This kit is for the 420A in the RS and GS.

Can I keep A/C and power steering?
Most installs keep A/C and power steering. Confirm clearance during mock-up.

Does it work with an automatic?
Yes. It fits both manual and automatic cars with the 420A.

How much power will I make?
Expect roughly +100 hp at 8 psi on a stock engine with a tune. Higher numbers need a built motor, fueling and more boost.

What else do I need?
A downpipe and exhaust, injectors, a fuel pump, a tune, an oil pan drain bung and a clutch rated for the added power.