what mufflers out there will fit and work?
the only ones i found were black widow.. i have blown out dual glass packs 2.5” to dual 3” per side
99 decibels idling 76 decible highway with the windows up 
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It might be worth taking a look at meganracing.com. They have some nice universal options for upswept tips. The problem I think will be, due to your L bumper, probably all of theirs would require cutting and re-welding. Or just maybe they could adapt in their manufacturing process for an upcharge?
76 dB highway is pretty decent, how quiet do you want to go? Maybe try inserts, the spiral or perforated cone style work well in my experience trying to get down to track day sound limits. There's also an L style Ansa muffler, those are pretty quiet.
i put spiral inserts on the tips, not sure if they made a difference at all, i haven’t measured it yet
FWIW, sound is measured in dBs or deci-Bels which are logarithmic air pressure numbers. So 1dB is about a 1.12X change in measurement strength. They do it this way because it mimics the way a human ear works.
From my autocross days, dual down-turned pipe ends are good for about a 1dB reduction on a std dB meter. Never checked 'racket-buster' tips. Having the pipe(s) end on the right side of the car also helps a bit, IF you are measuring like the tracks and cops do.
That is, the meter battery should be fresh and set on C-scale, Fast-response, 50 ft from the track, a foot off the ground (camera tripod) and at right angles to the driver's side of the vehicle. NOT hand-held or pointed up-the-tailpipe(s). ANY variation in the test will give wildly different answers. CA Noise Police lost several lawsuits for police 'innovating' their dB tests.
i took pictures before and after the test to make sure the meter was in the same position the tips made a 5 decibel difference but it’s still nutty loud.
the interior isn’t in the car to take it down the road, i’ve been dealing with an over temp issue and the weather broke in phoenix so i won’t know till next year but i think i’ll have to put the car up after 105 outside temp.. too hot to stay cool and use ac with 550hp anyway
gonna get the black widows installed as soon as i can