I ran 370 on a 2002 Wrx 5 speed including some track work for a few months and it didn't break - I was careful not to launch it though!
It also did some time at 390 on a 2.5 with over 400lb ft torque.
I was waiting for my 6 speed to arrive though!
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter
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