Comp Cams XFI NSR cam sets for the Mustang GT 4.6L 3 Valve modular engine is the first truly "drop-in" installation cams ever created. These cam sets require no additional computer tuning or valve spring replacement.
These camshafts are fully compatible with factory variable cam timing (VCT) system and are designed to operate in the stock RPM range. The Stage 1 cam set is designed to maximize mid-range power and torque!
Stage 1 - Great upgrade for stock engines. Solid power gains above 4700 rpm, compatible with stock springs. Works great with a mild tune however no re-tunings is required. RPM Range 750-6200