Nominal Sizes
Every manufacturer uses nominal sizes. Nominal sizes are typically a whole number rounded up from the “actual” size. AFX uses nominal sizes for just 5 parts. All other parts are actual sizes +/- .125″ variance.
| NOMINAL | ACTUAL |
| 1m | 39.25″ |
| 36″ | 35.25″ |
| 20″ | 19.625″ |
| 18″ | 17.625″ |
| 29″ | 28.75″ |
Due to historical numbering, the sizes in the table are “nominal” by sku (1MS, 36S, 20S, 18S, 2972S). All other custom size skus are actual (+/- 0.125″ variance). If you require an “actual” size, send the inside dimensions of your frame. AFX will provide the appropriate size/part number.
Do you need a custom size?
Measure the inside of your exhaust frame for length and width (or height). Send us your actual inside dimensions and we will provide the manufacturer part number!