The Borla CrateMuffler is purpose-built to optimize the sound and power of a specific engine family - here the Chevrolet small-block Hot 350/383. It delivers Borla's aggressive ATAK sound and is tuned to reduce or eliminate drone on cataloged applications. Directional flow: the outlet end carries the welded mounting bracket. 2.5in offset inlet / 2.5in center outlet on a 14in x 4.35in x 9in oval body. Premium T-304 stainless steel with CNC-accurate construction.
| Type | Engine-tuned CrateMuffler |
| Engine | Chevy SBC Hot 350 / 383 |
| Sound | ATAK (aggressive) |
| Inlet/Outlet | 2.5in inlet / 2.5in outlet |
| Configuration | Offset inlet / Center outlet - directional |
| Body | Oval - 14in x 4.35in x 9in |
| Material | T-304 stainless steel |
| Part Number | 400820 |
| Warranty | Million-Mile Warranty |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
