Budget does. Here's the website.
http://www.budgetexhaust.com/ 
All their prices are posted in candian dollars so don't forget to convert it.
Most of the y-pipes will yield the same amount of power. Some people have had some noise problems with the mandrel bent budgets I think. You might want to do a search on the org to find out more, but don't ask cause there's a bunch of jerks there ready to flame you if you ask anything. I have an aluminized steel non-mandrel bent warpspeed and I like it. I haven't had any problems. A stainless steel will probably last longer, but that's ok. I don't live in a part of the country that worries about corrosion so I went with the aluminized steel to save some money. Good luck.