Wayne Cook
August 2, 2007

K-Manifolds
When we compare these numbers with the baseline figures, there's no gain in horsepower and just a single lb-ft of torque. Since we know from experience the K-manifolds do produce some power, we can only conclude that our 2-inch tubing and quiet passenger-car mufflers are holding things back.

RPM HP TQ
3,000 126.7 221.8
3,200 136.9 224.7
3,400 147.4 227.7
3,600 156.1 227.7
3,800 163.2 225.6
4,000 169.2 222.5
4,200 174.1 217.7
4,400 178.2 212.7
4,600 180.9 202.2
4,800 179.7 196.6

Full-Length Headers
With the full-length headers in place, the numbers were as follows:

RPM HP TQ
3,000 133.8 234.3
3,200 145.3 238.5
3,400 155.5 240.3
3,600 165.4 241.3
3,800 173.4 239.7
4,000 179.0 235.0
4,200 183.8 229.9
4,400 187.5 223.8
4,600 190.6 217.6
4,800 190.8 208.8

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