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Baseline vs. using no muffler at all |
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Dynamometer Tests
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Baseline with K&N drop-in filter (test #5207) vs. stock exhaust pipe, stock catalytic converter, muffler removed (test #5223). Note: This is very loud. Please don't annoy your neighbors by driving without a muffler on the street. Tested on 97 S Series DOHC with stock internals. Measured at the flywheel.
| 5207 includes K&N drop-in filter, all else stock including stock muffler | | | | | | | | | | | | X>14.7=lean | | 5223 removes stock muffler - stock piping, stock cat, no muffler | | | | | | | | | | | | X<14.7=rich | | | | | | | | | | OIL TEMP | WATER TEMP | AIR FLOW | % LAMBDA | A/F Ratio | | | RPM | 5207 TQ | 5207 HP | 5223 TQ | TQ GAIN | 5223 HP | HP GAIN | DEG F | DEG F | SCFM | 1/AF RATIO | (X:1) | | | 4000 | 116.4 | 88.7 | 120.0 | 3.6 | 91.4 | 2.7 | 189.5 | 177.5 | 109.9 | 0.868 | 12.7644 | | | 4100 | 117.4 | 91.7 | 121.5 | 4.1 | 94.9 | 3.2 | 189.5 | 177.5 | 115.0 | 0.866 | 12.72346 | | | 4200 | 117.2 | 93.7 | 121.5 | 4.3 | 97.2 | 3.5 | 189.5 | 178.0 | 119.1 | 0.860 | 12.64859 | | | 4300 | 117.0 | 95.8 | 121.3 | 4.3 | 99.3 | 3.5 | 189.5 | 178.0 | 120.9 | 0.859 | 12.63136 | | | 4400 | 117.3 | 98.3 | 122.0 | 4.6 | 102.1 | 3.8 | 189.5 | 178.5 | 125.2 | 0.859 | 12.62645 | | | 4500 | 118.1 | 101.2 | 122.6 | 4.5 | 105.1 | 3.9 | 189.5 | 179.0 | 129.0 | 0.862 | 12.66752 | | | 4600 | 118.9 | 104.1 | 123.6 | 4.7 | 108.2 | 4.1 | 189.5 | 178.5 | 133.5 | 0.870 | 12.78837 | | | 4700 | 119.8 | 107.2 | 124.7 | 5.0 | 111.6 | 4.4 | 189.5 | 179.0 | 136.8 | 0.874 | 12.84701 | | | 4800 | 119.9 | 109.6 | 125.3 | 5.4 | 114.5 | 4.9 | 190.0 | 179.0 | 140.3 | 0.872 | 12.81542 | | | 4900 | 120.1 | 112.1 | 125.8 | 5.7 | 117.4 | 5.3 | 190.0 | 179.0 | 143.8 | 0.865 | 12.72212 | | | 5000 | 120.3 | 114.5 | 126.2 | 5.9 | 120.1 | 5.6 | 190.0 | 179.0 | 146.2 | 0.856 | 12.58082 | | | 5100 | 119.8 | 116.4 | 126.2 | 6.4 | 122.5 | 6.2 | 190.0 | 178.5 | 151.1 | 0.848 | 12.46453 | | | 5200 | 119.3 | 118.1 | 125.7 | 6.4 | 124.5 | 6.3 | 190.0 | 178.5 | 153.5 | 0.846 | 12.43842 | | | 5300 | 119.3 | 120.3 | 125.1 | 5.8 | 126.2 | 5.8 | 190.5 | 178.5 | 157.7 | 0.846 | 12.43743 | | | 5400 | 117.9 | 121.2 | 124.1 | 6.2 | 127.6 | 6.4 | 190.5 | 179.0 | 163.0 | 0.846 | 12.43717 | | | 5500 | 116.4 | 121.9 | 123.2 | 6.8 | 129.0 | 7.1 | 190.5 | 179.0 | 166.8 | 0.845 | 12.42356 | | | 5600 | 115.1 | 122.7 | 122.4 | 7.3 | 130.5 | 7.7 | 190.5 | 179.0 | 169.2 | 0.848 | 12.46622 | | | 5700 | 113.6 | 123.3 | 120.9 | 7.2 | 131.2 | 7.8 | 190.5 | 178.5 | 169.9 | 0.848 | 12.47218 | | | 5800 | 111.9 | 123.5 | 119.1 | 7.2 | 131.5 | 8.0 | 190.5 | 179.0 | 172.5 | 0.848 | 12.46491 | | | 5900 | 109.8 | 123.3 | 117.2 | 7.4 | 131.7 | 8.3 | 190.5 | 179.0 | 173.5 | 0.847 | 12.45036 | | | 6000 | 108.3 | 123.6 | 115.6 | 7.4 | 132.1 | 8.5 | 190.5 | 179.0 | 173.2 | 0.847 | 12.44679 | | | 6100 | 106.4 | 123.6 | 114.4 | 8.0 | 132.9 | 9.3 | 190.5 | 179.0 | 173.6 | 0.850 | 12.49036 | | | 6200 | 105.3 | 124.3 | 112.5 | 7.2 | 132.8 | 8.5 | 190.5 | 179.0 | 175.8 | 0.856 | 12.58855 | | | 6300 | 104.0 | 124.7 | 111.0 | 7.0 | 133.1 | 8.4 | 190.5 | 179.0 | 176.7 | 0.873 | 12.83153 | | | 6400 | 102.2 | 124.5 | 109.2 | 7.0 | 133.1 | 8.6 | 190.5 | 179.0 | 177.7 | 0.890 | 13.08375 | | | 6483 | 99.2 | 122.5 | 106.4 | 7.1 | 131.7 | 9.2 | 190.5 | 179.0 | 178.3 | 0.887 | 13.03491 |
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