Quote: I personally tested the log manifold vs the HP manifold on a 300 horsepower 440. We gained a whole 4 horsepower when we installed the HP manifolds.
What size headpipes did you use with each set of manifolds? One of the main differences is the outlet on the HP manifold is almost 2.5" , the log is I am pretty sure 2".
the question the OP needs to ask himself is the extra money to switch to the HP manifolds , in both the cost of the manifolds and the cost of the exhaust system change worth it to him ?
Some people just don't want to deal with the headaches involved with headers on a car that may only see the track , for fun and little else , maybe once or twice , a year ... or ever ...
