Estimated boost. This run was conducted without measuring probes installed on a second Bullitt. It also shows a 21hp drop from the comparable "GT, All Opt." run above, where the only meaningful difference is modified versus stock exhaust. This agrees with other exhaust tests.
Naturally Aspirated Bullitt Exhaust
As a bonus, Kenne Bell turned us on to some naturally aspirated exhaust figures from its Bullitt work. Wanting to know how much the aftermarket exhaust was worth on its test Bullitt, KB tested the car with both the goodies and stock exhaust. Here are the results.
| | HP | Torque |
| Stock | 244.9 | 277.7 |
| Modified | 250.6 | 287.5 |
The modifications were JBA short-tube headers, an MRT two-cat H-pipe, and a SpinTech after-cat.
| Dyno Results |
| | Stock Bullitt | Base Kenne Bell | Intercooled | Cold-Air Kit
9-lb Intercooled |
| RPM | Power | Torque | Power | Torque | Power | Torque | Power | Torque |
| 1,700 | 71.5 | 220.9 | 99.4 | 307.0 | 118.5 | 366.0 | 120.7 | 373.0 |
| 1,800 | 78.2 | 228.1 | 111.5 | 325.5 | 128.2 | 373.9 | 130.3 | 380.3 |
| 1,900 | 84.3 | 232.9 | 119.5 | 330.3 | 137.4 | 379.9 | 140.3 | 387.7 |
| 2,000 | 90.3 | 237.2 | 127.5 | 334.9 | 146.7 | 385.1 | 150.1 | 394.2 |
| 2,100 | 96.4 | 241.1 | 135.2 | 338.1 | 156.8 | 392.2 | 160.2 | 400.8 |
| 2,200 | 101.7 | 242.8 | 143.8 | 343.3 | 166.4 | 397.3 | 170.4 | 406.7 |
| 2,300 | 107.4 | 245.2 | 151.7 | 346.4 | 176.6 | 403.3 | 179.4 | 409.7 |
| 2,400 | 113.3 | 247.8 | 159.0 | 347.9 | 184.4 | 403.5 | 187.5 | 410.4 |
| 2,500 | 117.9 | 247.8 | 167.0 | 350.8 | 192.8 | 405.0 | 197.4 | 414.8 |
| 2,600 | 123.4 | 249.3 | 174.0 | 351.4 | 203.1 | 410.3 | 206.7 | 417.6 |
| 2,700 | 128.7 | 250.3 | 182.1 | 354.3 | 211.7 | 411.8 | 215.8 | 419.8 |
| 2,800 | 133.2 | 249.8 | 190.4 | 357.1 | 220.5 | 413.6 | 224.9 | 421.8 |
| 2,900 | 137.7 | 249.3 | 197.5 | 357.7 | 231.2 | 418.8 | 234.9 | 425.4 |
| 3,000 | 142.2 | 248.9 | 204.5 | 358.1 | 229.4 | 419.1 | 243.4 | 426.1 |
| 3,100 | 146.2 | 247.6 | 214.2 | 362.8 | 249.7 | 423.0 | 254.6 | 431.3 |
| 3,200 | 153.3 | 251.5 | 221.0 | 362.8 | 257.9 | 423.2 | 261.9 | 429.9 |
| 3,300 | 160.2 | 255.0 | 228.9 | 364.3 | 267.0 | 425.0 | 270.4 | 430.3 |
| 3,400 | 167.5 | 258.7 | 235.8 | 364.3 | 276.7 | 427.4 | 280.4 | 433.1 |
| 3,500 | 174.7 | 262.2 | 242.5 | 363.9 | 283.2 | 425.0 | 287.7 | 431.7 |
| 3,600 | 179.5 | 261.8 | 249.2 | 363.5 | 290.7 | 424.2 | 296.4 | 432.4 |
| 3,700 | 186.1 | 264.2 | 255.5 | 362.7 | 300.4 | 426.4 | 304.9 | 432.8 |
| 3,800 | 191.2 | 264.2 | 264.2 | 365.2 | 306.6 | 423.7 | 312.1 | 431.4 |
| 3,900 | 197.8 | 266.4 | 271.5 | 365.6 | 314.8 | 423.9 | 322.5 | 434.3 |
| 4,000 | 203.7 | 267.4 | 245.6 | 361.8 | 320.4 | 420.7 | 239.3 | 432.4 |
| 4,100 | 209.8 | 268.7 | 281.6 | 360.8 | 326.7 | 418.5 | 333.1 | 426.7 |
| 4,200 | 216.5 | 270.7 | 288.5 | 360.8 | 332.1 | 415.3 | 340.6 | 425.9 |
| 4,300 | 220.6 | 269.5 | 294.8 | 360.1 | 340.5 | 415.9 | 349.5 | 426.9 |
| 4,400 | 223.8 | 267.1 | 300.3 | 358.5 | 349.2 | 416.8 | 352.7 | 421.0 |
| 4,500 | 226.3 | 264.1 | 306.5 | 357.7 | 354.5 | 413.8 | 357.0 | 416.7 |
| 4,600 | 230.1 | 262.7 | 311.2 | 355.3 | 360.7 | 411.8 | 360.2 | 411.2 |
| 4,700 | 233.5 | 260.9 | 312.5 | 349.3 | 374.8 | 418.9 | 366.5 | 409.6 |
| 4,800 | 236.1 | 258.4 | 321.2 | 351.5 | 368.2 | 402.9 | 372.6 | 407.7 |
| 4,900 | 238.4 | 255.5 | 323.5 | 346.7 | 379.1 | 406.3 | 381.1 | 408.5 |
| 5,000 | 238.3 | 250.3 | 326.2 | 342.7 | 377.7 | 396.8 | 385.9 | 405.4 |
| 5,100 | 238.8 | 245.9 | 332.4 | 342.4 | 380.2 | 391.6 | 393.9 | 405.6 |
| 5,200 | 239.7 | 242.2 | 336.3 | 339.7 | 388.8 | 392.7 | 390.9 | 394.8 |
| 5,300 | 238.8 | 236.6 | 339.3 | 336.2 | 386.2 | 382.8 | 398.0 | 394.4 |
| 5,400 | 237.3 | 230.8 | 341.2 | 331.9 | 393.2 | 382.4 | 401.3 | 390.3 |
| 5,500 | 236.1 | 225.5 | 343.8 | 328.3 | 393.3 | 375.6 | 401.1 | 383.0 |
| 5,600 | 235.5 | 220.8 | 344.7 | 323.3 | 402.8 | 377.8 | 403.9 | 378.8 |
| 5,700 | 234.8 | 216.3 | 348.0 | 320.6 | 394.5 | 363.5 | 410.7 | 378.4 |
| 5,800 | 234.6 | 212.4 | 348.2 | 315.3 | 396.8 | 359.3 | 405.9 | 367.6 |
| 5,900 | 232.8 | 207.2 | 349.4 | 311.1 | 398.5 | 354.7 | 408.7 | 363.9 |
| 6,000 | 231.2 | 202.4 | 350.2 | 306.5 | 393.8 | 344.7 | 410.2 | 359.1 |
| 6,100 | 230.9 | 198.8 | 309.4 | 266.4 | 381.4 | 328.4 | 386.1 | 332.4 |