Ferrari 355 Capristo Exhaust Valve Kit

The Capristo Exhaust Valve Bypass Kit for the Ferrari F355 is a vital upgrade for owners looking to rectify a common factory design flaw while enhancing the car's legendary acoustic profile. This kit allows for manual control over the exhaust bypass valve, ensuring the 3.5L V8 can sing its high-pitched "Berlinetta" song at any RPM, while protecting the engine from the thermal stresses associated with the original valve operation.

Performance & Stance

The primary function of this bypass kit is to give the driver total authority over the F355’s exhaust flaps, which are notorious for staying closed too long under factory settings.

• Instant F1 Sound: By allowing the valves to be opened at low RPMs, the driver can enjoy the full, unrestricted V12-style scream of the flat-plane V8 without needing to reach the upper limits of the rev range.

• Thermal Protection: One of the most critical performance benefits is the reduction of heat soak. The factory valve settings often trap extreme heat in the headers; opening the valves manually allows exhaust gases to exit more freely, lowering engine bay temperatures.

• Acoustic Flexibility: The kit enables a "dual personality"—you can keep the valves closed for a civilised drive through urban areas or open them instantly for a raw, visceral racing experience - only when bought with the valve control kit together.

Engineering & Compatibility

Capristo has engineered this kit specifically for the F355’s unique vacuum-actuated system, ensuring it functions as a reliable, long-term solution.

• Failsafe Design: The system is engineered so that in the event of a power loss, the valves default to the open position, ensuring the engine is never at risk of restricted flow during spirited driving.

Installation Notes

• Plug-and-Play: This kit is designed to be as non-invasive as possible, typically plugging directly into the existing vacuum lines and electrical system without the need for permanent modifications.

• Universal 355 Fitment: Compatible with all versions of the F355, including the Berlinetta, GTS, and Spider (both 2.7 and 5.2 Motronic versions).

• Recommended Pairing: For the ultimate F355 setup, we recommend installing this kit alongside the Capristo Exhaust System and Capristo Heat-Shielded Headers to eliminate the risk of factory header failure while maximising the car's iconic sound.