Bumper / muffler fitment

[EJ-Fresno]

Guys,
I need some help, please

I have been trying since yesterday to install the set of cat pipes + FDM muffler (with the bent tubes added).

I am facing 2 issues:
- I can't stick the C-pipes all the way in the new muffler like I could in the stock one. Thus a rough fitment with the cat pipes and a tweaked muffler. Did any of you trim those C-pipes when installing a modified muffler?
- Do all bumpers accept the mufflers with the bent tubes added? Seems like mine won't allow enough clearance to be mounted back (pic of the bumper)


The cat pipes are fine since I can mount the stock muffler without any issue. Though, when I put back the stock cats, I still can't fit the FDM muffler.

Do I have to give up at the muffler or trimming the C-pipes should solve the issue?

Thanks!