Actually, it's a little more... a total of 8 oz with header, coupler & clamps... but on a 23x8 prop... 100 rpm at the top end makes over 1 lb more thrust.
It is still 1/4 lb lighter than the tuned pipe. The TP puts a lot of it's weight behind CG and costs $60 more though is supposed to give an extra 200-300rpm over the CHQP.
All in all the CHQP was a hands down winner for the Yak, and would be an excellent option for the Vision/DV too...
ORIGINAL: RCadmin
Interesting..so for another 3 oz or so you pickup 100 rpm on that big prop. sounds like it is worth it with the QP's light weight plus the benefit of being quiet.