i had that problem. believe it or not the biggest factors i found with having the exhaust is the hangers not lining up in the right spots. i had mufflex do my full exhaust from the header back (i already had the piping) and they cut the y, adjusted it, put a flange on the intermediate pipe for easy drop down of the exhaust. all in all they did an awesome job, under an hour. well under 200 bucks, including all clamps, bends, adjusting, welding and what have you. the axle over pipe was the most adjusting on my car cause of the size of my rear.
you shouldnt have any problem bolting up the borla though...its pretty straightforward
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