So i bought an APEXi Megaphone muffler off a guy I know for £10... too cheap to pass up if you ask me. it needs some piping welded up for it but not a big deal.
I googled it but couldn't find out much about it. apparently it was "the original single tip muffler" for tuning in japan and is good for improving mid torque.
Wondered if anyone could shed anymore light on it?

cheers