op- chances are the tips are rubbing your bumper. just get some small washers and lower the entire hanger bracket for the muffler section.
i had to do this too to even out the clearance of my fujimura muffler (also rear section only). if you're willing to pay the price the 2 short tails with cans, fujimura sounds fantastic.
the reasons why i did not go with the full catback is
1) fujimura sounds good. not super deep
2) nice appearance and plenty of ground clearance.
3) convenience easy to install and remove if needed.
4) weight reduction and performance gain (per manufacturer).
5) price. it's like <1/2 the price of a full catback (650 or something paid).
GL!