I just installed the profec e-01 boost controller and I must say it is a must have unit, The profec b was a good unit to have, and since I've had both in the last 6 months I can tell you hands down go for the profe e-o1. If money is an issue get the b of course. How ever the boost hits way harderwith the e-01 let me tell you! H-a-r-d-e-r way H-a-r-d-e-r. :bigthumb: :hail: :whip: