Try J+P catalog page 153.Milwaukee twins big growl exhaust, call them ,they may have them for 07's .Price: around $200.00,phone number-1-800-397-4844.
good luck,
captain m
Did see a set at the ROT Rally last year, a real attention getter and sounded
Bad A$$. There is allways a set of black ones on ebay...
Also a lot of Big Growls on there pretty cheap.
Check E Bay for the Big Growl pipes.I bought some for $129.00 on there.Place was called ZZ Chops.There were plenty of others selling them too.I ended up not using them on my bike, I just wanted to try a different style pipe without breaking the bank.They were decent pipes for the money and they sounded good.