http://www.supersprint.com/homeuk.htm
Try these, i've sold loads to customers and had no complaints.....

 

go to your local mufflar shop and have them bend piping to fit and weld on the muffler ,not a lot of money and you'll get the desired results

 

The problem with this is, exhaust shops usually dont do a lot of mandrel bending of pipes, and thats what you want...not the garbage.

 

You can buy pre-bent parts from Jegs or Summit, or if you're nuts and want Titanium or Inconel pipes, you can try www.burnsstainless.com. Then cut and weld them to fit... but unless you know a welder that's capable, you'll probably spend a few body parts and organs getting an exhaust shop to do it. You'd probably be better off buying a cat-back and paying an exhaust shop to make it fit if the dimensions are different between the sedan and coupe.