Interesting write up, thanks. I think your hacksaw must have been blunt. I had no problem cutting through my OEM pipe with one...and trust me, I'm nothing like the Hulk!
I would also advise against trying to loosen the rubber exhaust hangers. Much easier to unbolt the hanger brackets from the body, then remove the hangers off the car...
E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Meyle HD droplinks; BMS clutch stop; BMS CDV; RE g/box mounts; Saikoumichi OCC; K&N; Cyba scoops; BMW Perf Exhaust; M3 rear spoiler; LED Angels; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof