Yep mattyd i recessed my pipe into the fuz bottom, you can see how i did it in this picture. Its a lot of work but worth it.

As far as engines go if you are going i/c i'd definitely go the YS route. If you can afford the extra cost and 30% fuel go for the 160dz.

Otherwise angus' 140Dz are going pretty cheap!

Also put a hatori pipe on the ys. Weston do an in cowl unit which is also very nice if you dont want to go pipe tunnel. Ask the baron for more info.

and although the cheap gator softn safe mount works okay the pricey Hyde ari is well worth the extra dosh.