While the factory rated 500 horsepower for the GT500 is more than ample for many, those craving more power need to look no further that Roush Performance. Engineers at Roush are soon to release a new roots style supercharger said to boost power up over the 700 horsepower mark.
The “GT500 ROUSHcharger“ kits will be offered in three packages. The first is a cold air intake and ECU recalibration, providing an additional 45 ponies. The CAI considerably reduces pressure drop across the stock air box and filter element. It comes with a high-flow, large 6-inch conical filter and the rotomolded airbox seals to the hood to reduce leakage. Again, the bottom line is less loss equals more airflow which results in more power. This is the simplest upgrade and can probably be done with common hand tools in your driveway.
The next option is to replace the factory supercharger with a Roush unit. This is a massive 2.3L roots blower which will push your GT500 to well over 600 horsepower. Claiming an additional 120 horsepower and 88 lb.-ft. torque, this upgrade will not void your factory 3-year / 36,000 mile warranty. Parts list includes the ROUSHcharger, a 78mm non-removable pulley and of course a new ECU calibration.
The GT500 ROUSHcharger is a new derivative design from the current roots-style applications currently on the market and features a considerable improvement in both airflow and efficiency. The bottom line is the more airflow, the more power. Noteworthy is that this is the first application that will be incorporating this new technology, both on the OE and aftermarket side.
Finally, those living on the wild side cam get a non-warranty version of the ROUSHcharger (off-road use only *grins*) - anticipated to push the GT500 engine to a mind-boggling 700 horsepower, 200 more than the stock engine. Customers will have to purchase a 72mm or 76mm pulley separately, and this version does not include an upgraded calibration. We’d imagine Roush will be advising a custom dyno tune on this one – as you’ll be taxing the 5.4L modular engine pretty hard.
“Our engineers have really pushed the envelope with this ROUSHcharger and I think it is a credit to them to get as much as 200 horsepower out of the GT500 engine,” said Jack Roush. “We are expecting that there will be a certain number of Shelby owners who intend to keep their car in stock condition, but there are also going to be those who want to push that envelope and have bragging rights over their friends. From mild to wild, we can help them get where they want to go with horsepower. It all depends on if they want the peace-of-mind of having a warranty, or go right to the edge and let it all hang out.”
Available in black or chrome polished, the GT500 ROUSHcharger kits should be available by the end of the year. Pricing is still to be determined. For more information, visit the Roush Performance website or call 800-59-ROUSH. A signup form is available to be automatically notified when these kits become available.