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| Year | Engine | Before Muffler | After Muffler | Overall |
| 1966 | 383 440 |
2.25 inches 2.25 |
1.88 inches 2 |
2.25 inches 2.25 |
| 67-71 | 383 | 2.25 | 2 | 2.25 |
| 68-71 | 383 M | 2.5 | 2.25 | 2.25 |
| 67-74 | 440 | 2.5 | 2.25 | 2.25 |
| 1970 | 440 * | 2.25 | 2 | 2.25 |
| 69-73 | 340 | 2.25 | 1.88 | 2.25 |
| 74-76 | 360 | 2.25 | 1.88 | 2.25 |
| 1979 | 360 ** | 2.25 | 3 | 2.25 |
| 66-71 | 426 Hemi | 2.5 | 2.25 | 2.25 |
* Factory dual exhaust for 1970 Chrysler 300-H(urst) only
** Factory dual exhaust on F-body Road Runners and R/Ts after the muffler continued as one 3 inch single exhaust pipe
