What the vert needs.
https://www.artmorrison.com/convertibleframe.php
Only one place I know to do it, and up the power level.
As far as passing insp, I would be on the phone with local clubs and hot rod shops to find the worm hole.
Problem one, easy fix redo exhaust fit with quick time upgrade or cutouts depending on desire to obtain tickets.
http://www.quicktimeperformance.com/400116/index.php
Problem two spend money there are lots of options out there for car upgrade if you want to upgrade its a good time to buy modern...
Jeremi installed a set on a east car build he was impressed with them and talked about fabbing up a set for my five speed car but talk was were it ended.
Honestly before I tossed that kinda time and money into a band aid I would 8.8 swap out of a explorer toss the whole IRS in the trash.
I do...
This... Get a extra third member get it setup while still driving your car. Swapping it can be done in the driveway Same can be done with a j mod ~fair warning~ doing this will only increase the itch demanding that you get a tune...converter...so on and so forth. I would go deeper with the...
It could be something inside jamming it or one of the side gears came loose and is jamming it up or worse yet one side gear broke. I had them apart its not that bad once you understand how it functions.
Jay makes them, but his life is pretty busy right now, I can let him know if you want to upgrade, I also make them but as of right now the machine shop is closed while Im in the middle of a job change.
Jp's post at supercoupe is your best option at this point if your cars ass is wiggling and...
There should be no problem for a crew member to walk right up to the staging lights, put you in the water, stand at the beam, get you staged and video, a go pro would be the ticket.