| Business | Phone |
| Altair Engineering 1755 Fairlane Dr, Allen Park 48101 | (313) 438-9813 |
| Excel Rp Inc 6531 Park Ave, Allen Park 48101 | (313) 382-9195 |
| Roush Enterprises Inc 16640 Southfield Rd 900, Allen Park 48101 | (313) 294-8200 |
| Wagner Engineering 9241 Manor Ave, Allen Park 48101 | (313) 928-0776 |