The GReddy tC turbo kit provides instant horsepower that requires intermediate to advanced skill levels in wrenching and less than a day's time to install. With an MSRP of $3595 for the intercooled racing turbo kit minus an optional fuel management system, the tC turbo kit offers the consumer the flexibility to upgrade as demands for more horsepower grow over time. GReddy understands the importance of having the proper air/fuel ratio when dealing with forced induction and sells two optional fuel management systems for the Scion tC. Fuel management system number one comes with a pre-programmed e-Manage, 440cc/min injectors, injector harness, and the necessary clips to ease the installation process (msrp. $795). Using the E-Manage system is as simple as plugging in the unit as a piggyback system with the factory ECU. The e-Manage has been preprogrammed and can offer additional tuning and airflow maps that are not present in the factory unit. Using the e-Manage offers the consumer a smooth idle and engagement with its 16x16 injector duty cycle map using the larger 440 injectors.
This GReddy turbo kit is shown installed in a 2005 Scion TC. | 
Included with the kit is all the necessary hardware and a turbo oil feed line that will be tee-d off between the factory oil pressure switch. | 
With plenty of room available within the tC's engine compartment, the GReddy Airinx intake system has plenty of room away from the exhaust manifold and turbo. |
If purchasing the optional fuel management makes you hesitant, consider the fact that this unit can be reprogrammed at a later date if you should ever decide to perform a full engine buildup or turn up the boost. Option number two comes with a pre-programmed e-Manage Ultimate system and four 440cc injectors for the more hardcore tC owners on the market (MSRP $1175). In addition to standard e-Manage airflow-based adjustments, the Ultimate version includes new and upgraded features including improved direct map control for adding and subtracting fuel and ignition, the ability to switch between 2 preset tuning maps (i.e. street or race program) and maps for individual cylinder adjustment for both fuel and ignition. An additional sub injector control option is already hardwired and available on both the e-Manage and e-Manage Ultimate.
So what does the tC turbo kit feel like on the streets? We're not exactly sure because this is an off-road-use-only turbo kit (ahem) but I went along on a driving impression as we applied a heavy right foot to the accelerator through all four gears. The tC performed some tire smoking spins through first and second gear as it refused to gain traction. A series of tight turns through numerous banking corners also netted some tire squealing as the vehicle quickly shot through the RPM band. If you're in the market for the GReddy turbo kit, we highly recommend a limited-slip differential to control the newfound horsepower. Oh, and should I mention the (former) cool guy in the Lotus Elise that got his ass handed to him by the time the Scion was boosting in third gear? I'd rather not. You never know, his girlfriend might be reading this article.
Dedication to quality and craftsmanship has made GReddy a leader in aftermarket turbo kits. The attention to detail is obvious when they include a heatshield that protects the alternator from any damage. | 
Here's a close-up of the cast-iron downpipe sitting within inches of the heatshield. | 
Here's a rare shot for all you non Scion tC owners. The only part you should be familiar with is the taillights when this 258hp turbo kit leaves you in the dust. |