1999 Mitsubishi Eclipse GS-T - Power Pages

The Injen intake was simple to install since all the necessary brackets and connectors came complete with the unit. The mass air adapter and filter complement the engine bay in OEM fashion and the intake pipe installs just like factory. When comparing the OE pipe with the Injen unit, there was a very noticeable difference in restriction. The OE unit has a blow-off valve inlet causing restriction to the turbo. A quick pass on the dyno once it was fixed, unveiled hidden ponies-11 peak horses over baseline and 10 lb-ft of torque. Wow.

Since the '99 model is OBDII, there is a second O2 located in the exhaust system. Thermal incorporated a second bung to cater the needs of the OBDII vehicles. The bolt-on cat back exhaust system provided an excellent deep tone and plenty of power to back up the growl. On the rollers, 180.5 ponies and 199.1 lb-ft of torque were generated using the Thermal exhaust system.

The downpipe is by far the easiest of all the products to install; five bolts and the OE unit can be removed. The Buschur unit bolts in the same fashion as the OE piece using all the factory bolt holes. The downpipe brought out the power hidden in the turbo. Power from 3300 rpm on up was discovered, along with a peak gain of 188.1 ponies and 210 lb-ft of torque. Approximately five to 15 ponies were realized in the mid range.

Conclusion With just a few simple bolt-ons, the Eclipse was able to break into the 180-hp range. Already over 200 lb-ft of torque from the baseline, we are just a few more installs from laying down more torque to the wheels than the factory rating at the flywheel. Our next install will comprise of a Turbo XS boost controller, HKS Super AFR and a player yet to be named. Stay tuned for our next segment of 4G63 Power.

The FactsEngine Tested: 4G63Application: 1990-'99 Mitsubishi Eclipse, 1991-92 Galant VR-4Common Swaps: NoneReplacements: None