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The "before" test, taken in 1998. Mods done to the truck at this
point were:
- K&N FIPK
- JBA Headers and Y-pipe
- 3" Gibson Cat-back
- Mopar Performance PCM
- Taylor "Spiro-Pro" Wires
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The "after" test, taken in 2000. Between the previous test and this
one, the following items were added:
- MPI Intake
- 24lb injectors
- Hughes Cam, Valve Springs & Retainers
- F&B Stage I TB
- Roller Rockers
- Double Roller Timing Set
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Summary:
| 15mph readings | 25mph readings |
| Limit | Before | After | Net change | Percent change | Limit | Before | After | Net change | Percent change |
HC (ppm) | 107 | 33 | 52 | +19 | 57.6% increase |
103 | 63 | 30 | -33 | 52.3% decrease |
NO (ppm) | 786 | 342 | 419 | +77 | 22.5% increase |
712 | 488 | 381 | -107 | 21.9% decrease |
CO (%) | 0.59 | 0.12 | 0.20 | +0.08 | 66.6% increase |
0.57 | 0.28 | 0.03 | -0.25 | 89.2% decrease |
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