Go straight!!!
If you want loud get straight pipes.
Run mufflerless.
I did it for about 6 months and its very loud. So loud I had to take it off.
Currently I have the Maxspeed muffler and its a good product.
There is also the Pedro exhaust which was my favorite setup.
In the past I have had the straight pipes, pedro, and maxspeed.
There are videos of them all on my youtube page.
www.youtube.com/gwhand