Hi kiro29!
I use the spespipe on my mx-bike and I love revving so it?s a good pipe for high rpm.
Here do you have the history of spes:
"All Doma pipes are hand made and imported from Belgium where performance is more important than production volume. Dominique Slegers of Doma, is the son of the world famous Piero Slegers of Spes Pipes fame and between the two they have 14 world motocross and one world sidecar championship. With Piero's retirement, Domonique has incorporated Spes into the Doma organization. Doma are also sold in Europe under the following labels - Spes, Rino and Slechten and past users include Greg Albertyn, Stefan Everts, Joel Smets and Grant Langston and John Dowd."