| Business | Phone |
| Carlsbad Design 1070 S Santa Fe Ave # 15a, Vista 92084 | (760) 631-3528 |
| Southwest Engineering Inc 2358 Watson Way, Vista 92081 | (760) 599-8559 |
| Red One Engineering 1295 Distribution Way, Vista 92081 | (760) 509-0079 |
| R Tory Walker Engineering 138 Escondido Ave # 206, Vista 92084 | (760) 414-9212 |
| Crawford Performance 3459 Fairview Dr, Vista 92084 | (760) 631-2927 |
| Holeshot Engineering 2332 La Mirada Dr, Vista 92081 | (760) 727-5070 |