These are not the best pics but they may help... Pacesetter LT's to a Corsa cat back..
1- Off road also means no air fitting for air pump and no EGR fitting for EGR, both have to be deleted.
2- You can add universal mini cats in the y-pipe just behind the collectors if you want.
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Below pic is drivers side , front of car is to the left, the header collector ends, and the clamp is to the Y-pipe. In the back of pic is the passenger side and as stevo said the collector ends further back than the stock cat currently sits. Plus the stock cat is welded to the stock Y pipe it's all one piece.
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This pic shows the Y-pipe connection to the cat back, note I removed the old cat back front pipe that connected cat. In my case I used a 3" long extension to attach the Y to the cat back. Your Borla may be a different setup, but the pic shows where the Pacesetter ends about 4' behind the driveshaft safety bracket. Note the 3/8 washers I added to drop the bracket a bit for exhaust clearance. Also the cheapo steel 3" extension is starting to rust. This joint also serves as the exhaust break apart point, in case you ever have to tilt down the transmission for bolt access. Planning for future you should always have a point to open the exhaust w/o starting at the muffler and going forward.
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This pic shows ground clearance from passenger side, that's a 4 X 4.