Laugh if they will but I've been running a Profession Model WTC pipe on my Falcon 41 with RCMK power. For a low-buck eBay Chinese pipe, it works rather well but is loud unmuffled. You can see it when it comes on the pipe as the front end will jump up.

hi to all
I'm friend with johnnboy and helps me because I do not know English
The Falcon catamaran is mine and I have something questions
what is the most correct positioning of the strut with the Propeller 6717/3??
Thank you very much. (the message has translated Greek to English with google-translation)

Here I have 5 different images for the position of the strut.
img132.imageshack.us/gal.php?g=56598361.jpg

Easy to quiet down, get more torque as well without hurting top end ... actually may even run stronger

Place a secondary stinger into pipe too the mid band area of pipe, we call this an internal stinger and it is quieter because the pressure bleed is not at the end of cone where the sound waves are strongest, but at pipe maximum diameter where the sound waves are weakest .... thus MUCH quieter.
Find a piece of THIN WALL tubing the O.D. of stinger outlets I.D. and long enough to end up inside pipe to middle of the banded area and flush with pipes outlet.
Either tac weld it in place, pop rivet or clamp .... it WILL quiet pipe down !!

Scott wrote:
Mr Scott I put your message in the google translation and i could not understand exactly what you want to tell for the correct positioning of the Strut..
i put again 5 different photos,what is the right photo?? 1-2-3-4 or 5??I am very sorry for my bad english!!

1

2

3

4

5

Most OVAL duty Cats are set up like image #1


kapetanios wrote:

Thank you Mr Scott!
now expect to get 90 degree header and some props to make tests!
here is a video a few days ago with wrap to center header and Octura x670 and the strut is like second photo.

Looks like ya got her running pretty good!!! Great Job!!!

hello to all again!
I have a question,i got the new 90 degree header and a zero band pipe.my question is,how many centimeters should put the band from the cylinder for the highest rpm?
the pipe is stainless steel water cooled,Length 400mm (exclude header) and largest point of the pipe 52.5mm
thank you very much!

kapetanios wrote:
Measured down the CENTERLINE path from manifold at cylinder to peak/max diameter of cones in the range of @ 330 to 350mm, this for maximum power and rpm so long as prop size and load is not too great engine should do very well.

Mr Scott thank you very much for your reply.the prop is 6717/3 and i have one prop 6718/3 but i think is too big..?