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Even though it was still a couple of inches short of optimum, the collector extension (arrowed) was worth up to 40 lb-ft of additional torque in the 3,000 to 4,600 rpm range.
Exhaust Science Demystified

 Even though it was still a couple of inches short of optimum, the collector extension (arrowed) was worth up to 40 lb-ft of additional torque in the 3,000 to 4,600 rpm range.  View Related Article

 

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