Copyright 2003, Roadracing World Publishing, Inc.

The M4 product evaluation on page 111 of the November 2003 issue of Roadracing World has an incorrect dyno graph and power and torque tables. The M4 exhaust was dynoed back-to-back with the stock exhaust on a 2003 Suzuki SV650.

The correct peak horsepower and torque numbers are: 70.3 bhp @ 9000 rpm and 42.5 lbs.-ft. of torque @ 7000 rpm with the stock exhaust, and 74.5 bhp @ 9000 rpm and 45.6 lbs.-ft. of torque @ 7000 rpm with the M4 exhaust, as measured on a Dynojet dyno.

The error is due to an inconsistency between version 7.0.1.0 and version 7.0.7.14 of Dynojet’s RunViewer software. The same dyno run viewed with each version of the software showed a difference of nearly two horsepower. During the research and editing process, version 7.0.1.0 was used, but during the production (pre-press) process, version 7.0.7.14 was used. The software-induced changes in the numbers and graphs were not caught before the issue was printed.

The correct graph and tables will be printed in the December 2003 issue.