F6 Exhaust Length Limits for F6 in Road Race and Solo
#39929 from Carl Wassersleben · Recommended to the Board · Minutes (2026-05 Fastrack)
In F6, GCR section 9.1.1.D.14.B, change as follows:
"Any exhaust pipe(s) may be used (unless otherwise specified). It is the intent of this rule that the exhaust pipe includes the
exhaust manifold. The M maximum exhaust length behind the rear axle centerline without a sound control device or muffler is
twenty-four (24) inches. It is the intent of this rule that the exhaust pipe includes the exhaust manifold. The addition of a sound
control device or muffler is allowed. If a sound control device or muffler is used, the total length must not exceed thirty-six (36)
inches behind the rear axle centerline when combined with the exhaust pipe."