SPS

Baseline vs. cat-back exhaust with 4-chamber muffler

Dynamometer Tests

Baseline with K&N drop-in filter (test #5207) vs. cat-back exhaust with 4-chamber muffler (test #5210). Tested on 97 S Series DOHC with stock internals. Measured at the flywheel.        5207 includes K&N drop-in filter, all else stock                       X>14.7=lean 5210 adds 2.0-in mandrel exhaust pipe & chambered muffler                       X<14.7=rich                 OIL TEMP WATER TEMP AIR FLOW % LAMBDA A/F Ratio   RPM 5207 TQ 5207 HP 5210 TQ TQ GAIN 5210 HP HP GAIN DEG F DEG F SCFM 1/AF RATIO (X:1)   4000 116.4 88.7 116.7 0.3 88.9 0.1 191.0 184.5 106.0 0.861 12.6627   4100 117.4 91.7 118.6 1.2 92.6 0.9 191.0 184.5 112.0 0.857 12.59559   4200 117.2 93.7 118.8 1.6 95.0 1.3 191.5 185.0 117.7 0.855 12.56869   4300 117.0 95.8 118.8 1.8 97.2 1.4 191.5 185.0 124.4 0.852 12.52014   4400 117.3 98.3 119.0 1.7 99.7 1.4 192.0 184.5 130.0 0.850 12.50017   4500 118.1 101.2 119.8 1.7 102.6 1.4 192.0 184.5 132.1 0.851 12.50582   4600 118.9 104.1 121.0 2.1 106.0 1.8 192.5 184.5 136.3 0.858 12.61039   4700 119.8 107.2 122.2 2.4 109.3 2.1 192.5 184.0 139.9 0.861 12.65296   4800 119.9 109.6 122.2 2.2 111.6 2.0 192.5 184.0 142.2 0.860 12.63743   4900 120.1 112.1 122.5 2.4 114.3 2.2 193.0 184.0 146.5 0.858 12.60595   5000 120.3 114.5 123.2 2.9 117.3 2.7 193.0 184.0 152.8 0.842 12.3787   5100 119.8 116.4 122.8 2.9 119.2 2.9 194.0 184.0 153.5 0.840 12.35427   5200 119.3 118.1 122.3 3.0 121.1 3.0 194.0 184.0 155.0 0.845 12.41497   5300 119.3 120.3 121.9 2.6 123.0 2.6 194.5 184.0 162.5 0.848 12.4648   5400 117.9 121.2 120.6 2.7 124.0 2.8 194.5 184.0 169.5 0.847 12.44531   5500 116.4 121.9 119.8 3.4 125.4 3.5 195.0 184.0 170.5 0.844 12.40342   5600 115.1 122.7 118.3 3.2 126.2 3.4 195.0 184.0 171.2 0.844 12.40963   5700 113.6 123.3 116.8 3.2 126.8 3.4 195.0 184.0 169.7 0.844 12.41028   5800 111.9 123.5 115.3 3.4 127.4 3.8 195.5 184.0 170.9 0.846 12.43051   5900 109.8 123.3 113.2 3.4 127.2 3.9 195.5 184.0 171.9 0.844 12.41186   6000 108.3 123.6 111.5 3.3 127.4 3.8 195.5 183.5 172.9 0.840 12.34065   6100 106.4 123.6 110.3 3.9 128.1 4.5 196.0 183.5 175.9 0.843 12.38672   6200 105.3 124.3 108.5 3.1 128.0 3.7 196.5 183.5 178.8 0.853 12.54166   6300 104.0 124.7 107.2 3.3 128.6 3.9 196.5 183.5 177.9 0.866 12.7284   6400 102.2 124.5 105.2 3.0 128.2 3.7 197.0 183.5 179.4 0.880 12.93804   6483 99.2 122.5 102.1 2.9 126.3 3.9 197.0 183.0 179.4 0.879 12.91681

 

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