Honestly, them type of exhaust are made especially for single carburetor engines. They don't really work very well with dual carbs.
With dual carbs, they tend to be tougher to balance and the pipes really aren't very well made or of equal lengths.
I would suggest a "merged" header. All pipes are equal length giving a balanced exhaust which makes it easier to adjust and set the carburetors and sound great.
Here is the one that I currently have:
http://carcraftstore.com/mergeexhaustsystem.aspx
To quiet the system down, I installed the Phat Boy muffler:
http://carcraftstore.com/premiumphat...eaderonly.aspx
However, and this is very important!!! I was using a full flow oil pump like this one:
http://carcraftstore.com/oilfilterpumps.aspx
The above exhaust WILL NOT fit using that type of full flow oil filter. I had to end up getting a remote mounting type oil pump cover in order to use that merged header!!
However, it was worth it in the long run. It increased my performance quite a bit.
Also sounds a ton better than them dual horn type exhaust.
Kind of neat; I can run the Phat Boy muffler for times I am going on a road trip but if I just want to mess around town or make some short runs, I can unbolt the muffler and toss on the stinger that doesn't have a baffle.
loud as hell, but a hoot as I get a ton of looks........Maybe they are pissed due to being so loud, but I have fun with it.