Ron, I previosuly ran VSPECS(both regular and a speed). The B5 is an OVERALL more powerful and responsive motor. The Bottom hits hard but its a controllable chaos. Its not a light switch. The 2057 reallly smoothes it out in the buggy. Great combo for buggy. The top end is good, maybe not the fastest down the straight but definately not getting pulled by anything. After talking with Mike(bataille) he suggest a JP4 to unlock a little bit more top if its needed. I have not been on a straight that I really needed more. I think the biggest difference between the B5 and Vspec is the tuning and longevity. The B5 requires smaller increments on the needles. Once I got that figured out, she was Money!!!! The wear is amazing I've got about 2.5 - 3 gallons(Werks 30%) on each and they still have good compression and the internals look good. I am very impressed in what can been had for $200 bucks. I've got 3 B5's and they all run very good. You keep making these engines and I'll keep buying them. PERIOD. They have been reliable, powerful and the customer service you provide is top notch. Vspecs had always been the "safe" choice for me, I could tune them and i knew they would perform. THe B5 has filled that position now. For the price of a vspec I can get the B5 and a pipe. Werks for me!!!!!