I have a 2007 Heritage Softail Classic. I wish to change the stock pipes with something with a large diameter, dual pipes (on the same side I mean), and extending the length of the bike.

Any suggestions would be greatly appreciated.

 

Check out V&H Longshots.

 

Even better than the V&H Longshots are the V&H Bigshots Long. They have a bigger diameter than the Longshots.

 

Hardkrome makes pipes that are 3" diameter that look like the long shots, I had them on my metric, great fit and finish. Good sound too, even on a 750cc.