might be best to keep an eye on the for sale section, mongoose' s do come up now and again.
the janspeed aint cheap btw but with the setup you have it might be best to buy the janspeed dump pipe and wait for a goose tail section before fitting.
without looking at your de cat its hard to tell but the goose one will fit the janspeed front pipe no problems so you can combine the two
pics of the janspeed in my thread in the member' s R section
plus iv posted a little exhaust porn here and there if you want to know what it sounds like :lol: