yes but you just want a temporary fix.. but what if you get pulled over again during the time you have the car? Best option is to get the level within the limit required and not have to worry about it anymore..
changing a pipe from catback is still going to cause back pressure anyway.. so i don't see why it would harm your transmission.. you could also look at buying or trading with a member on here for cat back, etc.. someone will want to upgrade their system to 3.5inch and would prob even pay you a bit for the difference..
either way i would get a second opinion on the custom muffler to make sure you're not getting ripped..
I'm also not illiterate or immensely challenged.. just a smart arse.. you posted in the wrong section.. there is a for sale section.. and you said auction to the highest bidder.. also BTW auctions aren't allowed on this forum.. so i was just jks.. thought that was obvious?