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But this should handle it. By now, you've probably heard of Tremec's immensely strong (700 lb-ft) Magnum six-speed manual. The Raybestos Roush '13 Stage 3 Mustang project will benefit from Tremec's latest variant, the Magnum XL, developed specifically for S197 Mustangs. This extendedlength version brings along with it a swap-specific crossmember, an OEM-quality mount, and an SFI-approved steel bellhousing.