I went all over town looking for a shop to do true duels no one said they could do it without beating in the floor pans well i decided to get stock setup without cats i asked for a 80 series flow well 4 hours later and 425 bucks got me exaust with a 50 series and ******* sticking out pipes, its sounds quit and crappy my car shakes and the exaust squeks really bad louder then the exaust my car is quit and i think my .488 .510 cam should be heqard i have flotech headers on my car currently wtf do i do its quit and choking the freakin car and squeaky help they already said they couldnt change it thay said i asked for a 50 series so they said i lied

 

Show them the copy of the estimate you signed that said what you and they agreed they would be doing.

 

all the reciept says is 425.oo

 

Then you just graduated from a $425 class on how not to get work done at a shop.

Get an estimate in writing that details what they are going to do before you give them the keys. When the finished product doesn't conform to the work order, you tell them to fix it.

At the very least, you have a legit complaint about the shakes & squeaks. As for being too "quiet" (I assume you mean it isn't loud enough, not that it stops running) and ******* pipes, the verbal contract becomes your version of the truth against theirs in the eyes of the law (unless you have 3rd party witnesses).