Nobody can give this guy a straight answer?
Alright. Most of the vintage line moby pipes on treats aren't that great from most reviews. They are mostly restricted (though can be removed) but I also am curious to know what the insides of one of them are as nate bandit cut up a leo vinci cobra moby pipe and found that it was just a straight tube with the illusion of an expansion chamber.......lame. SO who knows how those treats pipes are inside, especially with the mixed reviews. The preball joint pipe on treats seems like it will fail after a month or so (just speculation- no one has had one for that long yet to write a review), and the other ones don't use a ball joint and all the weight of the pipe rests on the motor mounts and engine (some argue that this helps acceleration as it keeps yr variator in a lower gear for longer- i dunno). for 99 bucks they aren't terrible though. And if you are looking for just something to help out yr moby i would go with the simonini (not the sliding header) simonini. Carbon fiber silencer or not it doesn't matter but for the sake of picking one, go simo carbon fiber. Now don't expect AMAZING results but for your pricerange these are about as good as it gets.
The Ninja G2, G3 and/or dopplers are all rad pipes but require modifying your setup to take advantage of these particular pipes.
and are a bit more expensive.
Also, it would be a good idea to go with a 15 dellorto sha and 15 intake to take advantage of a pipe on that stock av7 cylinder. just to make sure. if you wanna port it too that would help!
Good luck dude.