What I have noticed right off the bat, car revs up higher faster, car is running lean and pops, need to enriched the mixture with better metering rods,Too soon to tell about mileage and power. Cost 120 to have the pipes made, 60 for y pipe 200 for the manifolds less than 400.00 for the whole set up. Sure beats paying almost 400 shipped for the front casting only.
