Active Bypass Muffler, F- and G-Model 911

Twin-silencer rear exhaust with electronically controlled bypass valves for early-style heat-exchanger layouts.

Published fitment: 901 · F-model 911 (1965–1973)
g-series · 911, 911 Turbo (1974–1989)
Recorded availability: Not currently orderable. Confirm with the supplier.
Recorded price: €3,819.51 · 2026-08-25
Official price excluding VAT. The reviewed page simultaneously displayed a not-available notice and an add-to-cart control, so the conservative availability state below governs.

Confirmed on the manufacturer’s page. Sources last accessed 2026-08-25; fitment is not independently verified.

ExhaustNot currently orderableConfirmed on the manufacturer’s page

Manufacturing

Manufacturer	CarBone
Origin	🇵🇱 Poland Vendor head office — place of manufacture not stated
Process	Fabricated / Welded
Additively manufactured	No
Material	Stainless Steel (grade not disclosed)
Notes	The listing states Type 304 stainless steel, but the taxonomy does not treat 304 as interchangeable with 304L. It is therefore recorded as stainless steel with the exact grade retained in this note.

901	F-model 911 (1965–1973) Designed around early-style SSI manifolds. Other early-style manifolds may require adaptation, and the rear bumper must be reshaped for installation.
g-series	911, 911 Turbo (1974–1989) Designed around early-style SSI manifolds. Other early-style manifolds may require adaptation. CarBone says the lower bumper section is removed and warns of possible non-US licence-plate clearance work.