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You very well could have overtightened something...the exhaust bolts only need to be tightened to 25 ft-lbs...tightening with an impact means they are probably closer to 125ft-lbs which could warp flanges.
Also check clearances around the transmission tunnel and those things, the Perrin had an issue where on some cars the resonator did not have enough clearance between the resonator and the trans tunnel and would hit the trans tunnel and make noise, easily fixed with a couple minor adjustments.
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Dark Blue 2020 Subaru Forester Sport, Name: Apollo - God of Music
WRB 2013 Subaru BRZ Limited MT, Name: Zeus - Father of all God's and God of Sky and Thunder
Perrin Cat-Back, ECUTek Tune by Kaizen Tuning, Perrin Silicone Radiator Hoses, Perrin Master Cylinder Brace, Perrin True Cold Air Intake
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