Mike,
Is this the trike Mitch had?
I extended the exhausts on mine last year with 20" long, 4" lengths of galvanized truck exhaust pipe with the stock tips attached to the ends. The piggies were extended with 3/4" copper tube and the 4" pipe was cheesecaked with 2" holes to lighten it.
It's not necessary to extend the piggies, although there seems to be a debate as to droning without the extensions.
My project and other similar ones are discussed at:
http://www.valkyrieforum.com/bbs/index.php/topic,84057.0.htmlCall me & I'll help you with the project. I've got welders, drill presses etc. needed for the job. We can do it in an afternoon.
Dan