Honda Odyssey and Pilot Forum

Hey I'm a new guy to the odyssey game. Just picked one up. They converted it to a 440. So let's start off with how do I figure out if it was a 250 or 350? Next I want to find a new tranny for it that has reverse. Where can I find parts for my machine? I really need an exhaust for it has a mcgiver one on it now. When I say that they litterally took pieces of pipe and made it. Would like a shock setup on it? Looking to have lots of fun but need it running right to do so they say its fast but I've yet to see it. So any help would be greatly appreciated.