It's a step in the right direction for comparisons. Click on my link and I have added a side by side dyno comparison of the Trinity Racing Stage IV system and the Yosh Slip-on. The Yosh set-up was done to their specs and it ran like ****. Harry messed with it for awhile and ended up with a 160 main, no airbox lid, and screen and snorkle removed. This set up also had the most open insert. When they were done it ran much better. The Trinity pipe had a 165 main and the rest was the same. Yosh is $399 for a slip-on and the Trinity full system is $439. You tell me which you would rather have for the money. When available to him Harry will gladly to a Yosh full system.

 

Hey 14mins! The CRF450 will be ready SOON! Axis finally showed up last week, LS Racing is building long travel a-arms now to ship this week since they were waiting on Axis. 53-56 hp with stock pipe! How many more ponies with Trinity's? New LS axle is on and works great. Pink pants on back order because they're in demand by Raptor riders.lol Mark, tell fam. we said hi.

 

I don't know about that article. The also removed the lid and snorkle. No way they only got .4 hp with the lid removed and a slip on. I got 6-7 with that and my HMF slip on.