I really thought that JASMA was just Japanese DOT stamp
(whoops, looks like you found that out)
Some pics @
http://www.honda-tech.com/zerothread?id=750349
Mugen emblem is on the convergence of the runners
Jasma is on the start of a runner
Also, from what Ive read, in 1998 Honda copied the design and used it on the later version of the itr 4-1...so dyno plots would be the same if thats true.