SPS

Baseline vs. cat-back exhaust with straight-through muffler

Dynamometer Tests

Baseline with K&N drop-in filter (test #5207) vs. cat-back exhaust with straight-through muffler (test #5211). 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 5211 adds 2.0-in mandrel exhaust pipe & straight-through muffler                       X<14.7=rich                 OIL TEMP WATER TEMP AIR FLOW % LAMBDA A/F Ratio   RPM 5207 TQ 5207 HP 5211 TQ TQ GAIN 5211 HP HP GAIN DEG F DEG F SCFM 1/AF RATIO (X:1)   4000 116.4 88.7 117.4 1.0 89.4 0.7 179.5 185.5 105.7 0.861 12.65287   4100 117.4 91.7 119.5 2.1 93.3 1.6 180.0 185.5 111.8 0.860 12.63899   4200 117.2 93.7 119.6 2.4 95.7 2.0 180.5 186.0 116.3 0.860 12.63839   4300 117.0 95.8 119.5 2.5 97.9 2.1 181.5 186.0 119.6 0.857 12.60405   4400 117.3 98.3 119.9 2.6 100.5 2.2 182.0 186.0 123.8 0.859 12.62769   4500 118.1 101.2 120.8 2.7 103.5 2.3 182.5 185.0 127.9 0.865 12.71261   4600 118.9 104.1 122.1 3.2 106.9 2.8 182.5 185.0 132.6 0.873 12.83908   4700 119.8 107.2 123.4 3.6 110.4 3.2 182.5 184.5 136.2 0.874 12.84917   4800 119.9 109.6 123.5 3.5 112.9 3.2 182.5 184.5 141.0 0.869 12.77787   4900 120.1 112.1 124.2 4.1 115.8 3.8 183.0 184.5 145.3 0.868 12.75884   5000 120.3 114.5 124.2 3.9 118.2 3.7 183.0 184.5 149.6 0.857 12.59615   5100 119.8 116.4 123.9 4.0 120.3 3.9 183.5 184.5 154.0 0.853 12.53713   5200 119.3 118.1 123.8 4.5 122.6 4.5 184.0 185.0 157.1 0.852 12.52781   5300 119.3 120.3 123.1 3.8 124.2 3.8 184.0 185.0 161.8 0.853 12.54124   5400 117.9 121.2 122.1 4.2 125.5 4.3 184.0 185.0 165.5 0.851 12.50659   5500 116.4 121.9 121.0 4.6 126.7 4.8 184.5 185.5 167.7 0.848 12.47279   5600 115.1 122.7 119.8 4.7 127.7 4.9 184.5 185.5 170.9 0.849 12.48589   5700 113.6 123.3 118.3 4.7 128.4 5.1 184.0 186.0 172.8 0.849 12.4864   5800 111.9 123.5 116.6 4.7 128.7 5.2 183.0 185.5 175.6 0.849 12.47837   5900 109.8 123.3 114.9 5.1 129.1 5.7 182.5 185.5 176.6 0.848 12.46428   6000 108.3 123.6 113.2 5.0 129.3 5.7 182.0 185.5 177.7 0.847 12.45163   6100 106.4 123.6 112.2 5.8 130.3 6.7 181.5 185.5 178.2 0.850 12.49215   6200 105.3 124.3 110.2 4.9 130.1 5.8 181.0 185.5 179.8 0.859 12.62458   6300 104.0 124.7 108.6 4.7 130.3 5.6 180.0 185.5 182.0 0.875 12.86365   6400 102.2 124.5 106.9 4.7 130.3 5.8 180.0 185.5 183.2 0.891 13.09512   6483 99.2 122.5 104.9 5.6 129.2 6.7 180.0 185.5 181.3 0.889 13.0627

 

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