The EGIG PERFORMANCE Revo is a high-end resonance exhaust system for high-performance Vespa small-frame engines. It is designed primarily for the EGIG 220 Triple and EGIG 220 Revo cylinders—that is, for setups with a large exhaust port area, sporty valve timing, and a clear focus on performance. Its characteristics are modeled after the well-known BOA line: good, rideable low-end power, a wide usable power band, and sufficient reserves for powerful small-frame engines. Structurally, however, the Revo takes a different approach: the large body largely disappears beneath the chassis, leaving the area under the side fairing significantly tidier.
EGIG PERFORMANCE
Revo
High-End Exhaust
for EGIG Triple
for EGIG Revo Cylinder
Characteristics and Application
The Revo is designed for engines that are tuned not only for peak power but also for a usable RPM range. Compared to systems heavily focused on high RPMs, it delivers a practical resonance response and remains easy to ride across a wide RPM range after the resonance kick-in. This makes it particularly appealing for EGIG 220 Triple and EGIG 220 Revo setups, where the engine needs to accelerate cleanly out of corners while still revving high at the top end.
Technical Concept
High-end resonance exhaust for high-performance Vespa small-frame engines
Primarily designed for EGIG Triple and EGIG Revo cylinders
Character similar to BOA: good pre-resonance performance and wide power band
Sleeker routing with the body positioned under the chassis
The muffler extends visibly toward the rear, eliminating the large “belly” look under the side fairing
Suitable for engines with a large exhaust cross-sectional area and appropriate valve timing
For EGIG Triple and EGIG Revo cylinders
The Revo exhaust is primarily designed for modern EGIG high-end cylinder concepts such as the EGIG Triple and the EGIG Revo. These cylinders offer the necessary exhaust cross-sectional area and the appropriate power range to make effective use of the exhaust’s broad power band and strong low-end response. While the Revo can be installed on weaker or significantly tamer engines, its true performance window clearly lies with heavily modified small-frame setups.
Compatible Engine Base
EGIG 220 Triple cylinder with matching exhaust port machining
EGIG 220 Revo cylinder with sporty valve timing
Small-frame engines with ample exhaust port area and a powerful resonance setup
Setups with approx. 190° exhaust valve timing and 28–30° early exhaust
Engines with properly tuned carburetor, ignition, and gear ratio settings
Slim layout instead of a large belly under the hood
In the classic BOA design, the large belly under the side fairing was a defining feature. Visually striking, technically effective, but also space-intensive depending on the vehicle and setup. The Revo takes a different approach: The body runs significantly lower and is elegantly concealed beneath the chassis. The only visible part is the muffler, which protrudes rearward from the vehicle.
Practical advantage of the Revo design
More space under the side hood, since the large belly is no longer located there
A sleeker side profile despite the resonant exhaust design
Body largely routed beneath the frame
Striking yet clean appearance with a muffler extending rearward
Recommended valve timing
The Revo performs best on engines that have sufficient exhaust port area and appropriate valve timing. A rough target range of approximately 190° exhaust valve timing and a pre-exhaust angle of 28–30° has proven effective. This ensures the exhaust gets enough flow without limiting the engine to a narrow RPM range.
| Engine Concept |
High-Performance Vespa Small-Frame Setups |
| Primary Application |
EGIG 220 Triple and EGIG 220 Revo Cylinders |
| Character |
Good low-end torque, wide usable RPM range |
| Exhaust |
A large exhaust port area is recommended |
| Exhaust timing |
Approx. 190° as a reasonable target range |
| Advance |
Approx. 28–30° |
| Installation note |
Shock absorber offset required |
Tuning and handling
The Revo is not purely a test bench exhaust designed for a narrow RPM range. Its strength lies in the combination of pre-resonance drivability and a broad power band after the resonance kick-in. This makes it suitable for engines that aren’t meant to be kept at a precise RPM at all times—whether on the road, during spirited driving, or when cornering at high speeds.
Important for Tuning
The Revo requires a properly prepared engine. Exhaust ports that are too small or significantly tamer valve timing can underutilize the exhaust. For optimal results, the cylinders, exhaust port machining, carburetor, ignition, and gear ratio should be matched to the desired RPM range. On EGIG Triple and EGIG Revo cylinders, the foundation for this is already very close to the exhaust’s intended operating range.
Installation Instructions
Because the exhaust body is routed under the chassis, a shock absorber offset is still required. This creates the necessary clearance around the shock absorber, tire, and exhaust body. As with any resonant exhaust, clearance, suspension travel, tire width, and shock absorber position should be checked before final installation.
Plan for shock absorber offset
Check clearance around the tires, shock absorbers, and body
After the initial installation, check all bolted connections and springs
Adjust the carburetor jet settings and ignition timing to match the new exhaust system
If cylinders have been machined, check valve timing and exhaust port diameter in advance
Comparison with the BOA
The Revo doesn’t simply adopt the BOA’s design; rather, it takes its fundamental driving character and implements it in a different configuration. Those who appreciate the broad, easily exploitable power curve of the BOA class but prefer less volume under the side cowl will find the Revo to be a modern, high-end alternative with a unique layout.
Conclusion
The EGIG PERFORMANCE Revo is a high-end resonance exhaust for powerful Vespa small-frame engines and pairs particularly well with EGIG Triple and EGIG Revo cylinders. It combines a rideable, resonant exhaust character with a broad power band and a significantly sleeker layout than classic systems with a large belly under the side cowl. If you’re building a powerful EGIG engine with plenty of exhaust port area, the Revo is the perfect exhaust for a strong, rideable, and technically balanced setup.
FAQ
The Revo is primarily designed for the EGIG Triple and the EGIG Revo cylinders. It’s compatible with engines featuring a large exhaust port area, such as a 190° exhaust port and a 28–30° front exhaust port.
Yes. A shock offset is required for installation to ensure there is sufficient clearance between the exhaust body, the shock absorber, and the tire.
The Revo is modeled after the BOA’s drivable characteristics—with good early-rev performance and a broad power band—but uses a different routing. The large belly section no longer sits under the side fairing; instead, the body is routed under the chassis.
Yes. The Revo is a high-end resonance exhaust system for heavily modified Vespa small-frame engines and really shines on EGIG Triple and EGIG Revo cylinders.
Yes. After switching to a resonance exhaust, the carburetor jet settings, ignition timing, and gear ratio should be adjusted to match the engine’s new operating range.
DE | €
