Updated Exhuast, Help.

[benjaminbreeze]

Okay so here goes...
i took my svx into a muffler shop and wanted to get some custom magnaflow exhaust done. The guy was retarded and talked me into a bunch of stuff (me being clueless at the time) and took off my main cat. He also cut where the pipe comes right off of the two precats(leaving them there) but removing the sort of natural Y-pipe that had 2 pipes comign out(to go into the 2-1 cat) that WAS there and put in a 2-1 Y pipe I have a resonation at 3k rpms and it is due to this and now i am wondering if i have to get the whole front end off the headers (precats annd pipe and flange) to put on another 2-1 cat?
If you need any more explanation just ask, Thanks
Ben