Need some helpful advice. Car will not start. It doesn't even crank. I still get power to all of the car's electronics though. Car is a 2008 Mustang GT with a 5-speed. About 54K miles. List of mods are: Pypes long tube headersPypes shorty H-pipe & Pypes pype-bomb muffler deleteNo cats & no mufflersBBK CAIGT500 Throttle bodyRAM Clutch & RAM Steel FlywheelHurst Billet ShifterSCT Bama Tune from American Muscle with 93 octane I was driving, then heard a loud screeching noise. I pulled over within a few blocks once I knew my car was making the noise. After I cut the car off, it never started back up again. Checked oil level...oil level is fine.Removed the battery and had it tested. Works fine.Checked all the battery terminal connections. All good.Removed the starter and had it tested. Works fine.Raised the rear wheels off the ground, put the car in neutral and rear wheels spun freely....so the problem isn't in the rear end gears. I tried to manually turn the crank from the front of the engine with a socket wrench, but crank did not budge. The car is in neutral, so the crank should turn freely....but it doesn't. I even removed the accessory pulley belt thinking maybe an accessory pulley froze. All pulleys spin freely....except for the crankshaft pulley. Something is preventing the crank & flywheel from turning and starting the car. At this point, I'm starting to think I might have internal engine damage or a broken oil pump. But before I start tearing my engine apart I want to get some insight on possible causes & solutions. Anyone has any insight?