The Fast Lane modified 12-803 Regulator utilizes some old NHRA Pro Stock technology. The body is ported so the seat opens quicker (very important in progressive controller applications) and it reduces foam. Flow bench tested through their PSI range's to produce a consistent fuel delivery. The spring and spring rate is changed to get rid of harmonics that happens at certain rates of flow on production regulators. This regulator will flow over 600 PPH of fuel at 6 psi. Data loggers have proven this regulator offers more stable fuel pressure throughout the run.. Set it and forget it. Only $60.00