only run them wet face, laid into the keel,

i run a 2 x 200 and 3 x 36 and they are amazing

We use to run 3-5kw in the pro boats some in wet some through hull never had any issues, but we had them installed by the pro's.

 The 200khz will run OK in a wet box, the 38khz will not. Refer to some of my earlier posts concerning these transducers and mounting locations. We have installed them in wet boxes, transom mounted and wet faced and tested the same by hanging the transducers over the side of the boat to directly compare with a wet box installation. If you are going to the expense of buying the transducers then install them in a fairing block. 

 Thanks for your advice. ....need a couple months to save up for installation. ...

 And it reads bottom clear as mud out deep 500m at 10 knots and I still get clear signal its hard to wet face such big trannies on a cat. So I had to go wet box , if you can go wet faced it will always be better than wet boxed

Does anyone have a furuno 3kw in a wet box? I recently purchased one and I would like to know what results you are getting? The other transducer is a 2 kw 200Khz.

Seaswirl, sure do .... I have  Furuno 3KW 28khz and a 2kw 200khz in a wetbox and it works perfectly. I get good results and I didnt entertain the option of wetface in my F/G boat as no need to IMO! 

 Thanks so much for the info. 

 Does anyone know who installs these trannys into fibreglass boats at all? Cruise craft EX720 Thanks in advance

 Tried Ben at Fibrelight? 

Try Ben at Fibrelite Boats or Alex at AllMarine Services