These here are the dyno charts for the Speedmaster and America 865cc models fitted with both standard and Thunderbike mufflers,as displayed on our website.
And these here are the dyno charts for 3 types of mufflers tested on the 790cc models as displayed on our website.
If you care to check the actual information on the page -
http://tinyurl.com/2bnasw - you will find all the information is there.
The 'hype' as you describe it was no doubt referring to the increase in peak power obtainable on the inital 790cc models, at NO time have we ever claimed the same results from the 865cc versions. Our entire camshaft manufacturing project was based on the restricted nature of the 865cc models breathing abilities and whereas the 790cc was uncorked with a bit of external modifications the 865cc required internal fettling. The 'hype' as you call it is/was 100% true and accurate - you are simply applying the results obtained from the earier version to a model that they were never claimed for.
Glad to hear that you are happy with the work Mike, we appreciate the informative unbiased thread
Quote:
A 4HP increase from stock pipes to T/B pipes? So much for T/B's "28% increase" claims..... I have a set by the way and I'm happy with them. I just don't (didn't) believe the hype.
I wonder what the HP gains were with "air box mods, AI removed, 135 mains", prior to the head work and cams?
Exactly where were you standing when the big bag of money fell on you? 
Great write-up and thanks for the info!
Regards,
Tom
