Upgrading fuel injectors may be a necessity when changing turbochargers, exhaust headers, throttle bodies, fuel systems, or cylinder heads. It's important to insist on the best. PRECISION TURBO brand fuel injectors are individually hand selected, flow checked, and matched to within 1% of each other for optimum performance from your vehicle. All horsepower ratings are based upon a 90% duty cycle at 43.5 psi of fuel pressure based upon a BSFC of .50. Compatible with all well-known aftermarket drivers (unless otherwise noted).