I have not had my RDZ pipes for very long,but they seem to be working out good so far.Their a race pipe and,probably not what you need.Got alcohol right after I got the pipes,and I hope to have the jetting dead on soon.Had T-5's before these,they worked great for an all around pipe:good mid range and top end.DO NOT buy the T-6's.I hated them!They had no top end.Had to drop a tooth on the front sprocket to try to get them to pull top on top end.Traded them for T-5's.I don't think you can go wrong with the T-5's.