Off Road Exhaust System

Years 1963–79 Models 3 Factory citations 6

Also described as Off-Road Exhaust SystemOff road service exhaust

Documented applications

Corvette (C1 / C2)

1963 Factory-verified

$37.70; count n/a

GM Heritage factory kit — 1963 Chevrolet Corvette, p.5.
1964 Factory-verified

$37.70; 1,953 built

GM Heritage factory kit — 1964 Chevrolet Corvette, p.17.
1965 Factory-verified

$37.70; 2,468 built

GM Heritage factory kit — 1965 Chevrolet Corvette, p.14.
1966 Factory-verified

$36.90; 2,795 built

GM Heritage factory kit — 1966 Chevrolet Corvette, p.14.
1967 Factory-verified

$36.90; 2,326 built

GM Heritage factory kit — 1967 Chevrolet Corvette, p.57.

Corvette (C3)

1968 Factory-verified

$36.90; 4,695 built

GM Heritage factory kit — 1968 Chevrolet Corvette, p.7.

Impala / Full-Size

1963–70s (varies) Single-source

This page aggregates every documented appearance of N11 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.