Anybody got any good or bad stories about the boxes to bump your rev by 1000 RPM's? Also I think I saw a power-rectifier, same questions with that? What does the rectifier actually do? I have an 03 Z400 with a full Yoshi, jetted w/ K&N......Is it worth the money to get these?

 

Get the Rev box, also are you running open airbox cause you really should.

 

the srp box works good. the rectifier makes it so your magneto stops charging the battery when its fully charged.

 

i got the srp too and it works good..