Header Dyno Testing & Comparison, Tri Y vs. 4 Into 1 - Performance By Design
As expected, the 4-into-1 header offered the highest peak power, measuring in at 204 hp. Interestingly enough, the 4-into-1 offered the highest peak torque reading as well, measuring in at 143 lb-ft. The high-rpm improvement was accompanied with a slight penalty in midrange performance.
| Dyno Data: Stock vs. Tri-Y |
| 4-Into-1 (Horsepower) |
| RPM | STOCK | TRI-Y | 4:1 |
| 4,000 | 84 | 84 | 85 |
| 4,500 | 101 | 101 | 101 |
| 5,000 | 115 | 116 | 114 |
| 5,500 | 137 | 138 | 134 |
| 6,000 | 150 | 151 | 150 |
| 6,500 | 165 | 167 | 167 |
| 7,000 | 181 | 184 | 185 |
| 7,200 | 191 | 193 | 196 |
| 7,500 | 194 | 199 | 202 |
| 7,700 | 195 | 201 | 204 |
| 8,000 | 191 | 196 | 198 |
| 8,500 | 186 | 192 | 193 |