Philly had a chance this weekend to test a West 50 against the Os 46 and the YS 63

All on the same prop only diffo the Ys was on 20% nitro and the OS on a muffler.

Os 46 a limp 9,200 In its defence it was on a standard muffler!!

West 50 on throttle pipe 11,000

Ys 11,900

I am sure I saw on this thread in the past a chap who reckoned 12k plus for the West on a 13x 4w??

Spoke to Big Al he reckoned the pipe on the model I tested (a Madness) was a mini not throttle pipe??

The only true throttle pipe at this size fits the Hype and the Capiche 50

We will see.