Here's the finished look with...
Here's the finished look with the 7-year-old tti tailpipes joined to the X-pipe and the Ultra Flos. This is the exhaust configuration for our return test-and-tune that was faced with worse weather conditions. The tailpipes lowered the decibels a few points and reduced interior noise to a more tolerable level for the 90-minute ride to-and-from E-Town. Running without tailpipes on a street-driven car is not a healthy idea.
Dragstrip Results
- 67 R/T
- 030 over 440, 950 Holley HP, MP Ml intake, ported Edelbrock heads, Comp Cams .575 lift street roller cam
- 3.73 gears
- 9 1/2-inch converter
- 2-inch tti headers and 3-inch exhaust,
- 30X9-15 Hoosier radial slicks, 26-inch front runners
- 3,880-3,910 test pounds
- 2,000-rpm launch w/6,300-rpm up-shifts, 5,900-6,000 trap rpm.
| Run# | Tuning | Temp | 60-Ft | 1/4-Mile | MPH | Decibels* |
| 1. | H-pipe w/Super Turbo's | 77 degrees | 1.60 | 11.15 | 121.10 | 93 |
| 2. | H-pipe w/UItraFlo's | 79 degrees | 1.57 | 11.01 | 122.39 | 100 |
| 3. | X-pipe w/UltraFlo's | 82 degrees | 1.56 | 11.02 | 121.80 | 97 |
| 4. | X and Ultras w/TP's, retest | 85 degrees | 1.56 | 11.11 | 121.10 | 95 |
| 5. | #76 secondary jets | 86 degrees | 1.59 | 11.17 | 120.62 | 95 |
| 6. | #80 secondary jets | 88 degrees | 1.58 | 11.15 | 120.88 | 95 |
*Sound meter was held 50-feet from the burnout box.
Decibel reading was from a steady 5-second, 5,000-rpm burnout.