SC Project S1 ExhaUST 2-1 Stainless Steel full exhaust system for Aprilia RS 457 2024-2025

SC Project S1 ExhaUST 2-1 Stainless Steel full exhaust system for Aprilia RS 457 2024-2025

1. Product Overview & Design Intention

The SC‑Project S1 full exhaust system (Part No. A30A‑AC177A) is a purpose‑built, racing‑only upgrade for the Aprilia RS 457 (2024–2025). Constructed entirely from AISI‑304 stainless steel, it features SC‑Project’s signature S1 silencer design, a deep conical profile, and a carbon fibre end cap with a riveted aluminum SC‑Project logo. The system emphasizes raw tone, maximum durability, and visual aggression, tailored for riders seeking maximum presence and performance on track.

Developed in close collaboration with Aprilia Racing, the goal is to deliver measurable performance—and unmistakable style—while shedding excess weight.

2. Technical Specifications & Performance Gains

The deep tonal character is achieved through the conical S1 silencer profile, providing SC‑Project’s trademark aggressive growl right from startup.

3. Included Features & ECU Management

The ECR (Electronic Catalytic Remover) module is included with the S1 kit. When the stock catalytic converter is removed (as required to install this system), the RS 457’s ECU may log errors or limit performance. The ECR connects to the OBD port to simulate the catalytic readings, preventing faults and ensuring the ECU operates normally—without needing an ECU remap.However, remapping (e.g. with UpMap or Gabro) is recommended for optimal throttle response and fuel delivery.

Installation is fully plug‑and‑play and reversible, with no permanent modifications to the factory wiring or chassis.

4. Real‑World Feedback & Sound Character

Community feedback highlights two consistent themes: exceptional tone coupled with ferocious volume.

On Reddit:

“Not gonna lie, … it’s obnoxiously loud. Your biker buddies will tell you it’s awesome, but most other people hate you.”

“Sounds pretty damn bad ass … It sounds great but it’s a bit too loud.”

As another user notes:

“A few too many pops for me on the way down… That sounds way better than I expected!”

Overall users report the S1 as significantly louder than stock—both with and without the removable baffle. Ear protection is strongly advised.

5. Installation Experience

Reddit users who installed the S1 on an RS 457 praise its simplicity:

“Not challenging at all—I had the OEM one removed and the new one installed in less than 2 hours. Just need a T25, T20, T40, 8 mm and 10 mm.”

The fitment is straightforward; however, some report occasionally tight clearances or mismatched alignment likely due to nuance in chassis variants—not necessarily RS457 specific.

6. Build Quality & Aesthetics

SC‑Project’s craftsmanship is evident:

• Hand‑tigged welds ensure durability and precision.

• Uniform stainless finish paired with the carbon fibre tip delivers a premium feel.

• The riveted aluminum SC‑Project logo plate adds a clean, refined branding detail.

These elements capture SC-Project’s Italian styling ethos—form meets function.

7. Legal & Compliance Notes

• The S1 system is marketed for race use only and does not meet European road‑legal standards for emissions or noise.

• Noise levels even with the baffle (~104 dB) often exceed local track-day or road noise restrictions.

• Garage or city riding with this system may draw regulatory attention, especially in urban noise-sensitive zones.

• The exhaust may impact OEM warranty coverage, particularly regarding emissions or ECU-related services. However, reverting to the stock system and removing the ECR restores original compliance fairly easily.

8. Pros & Cons Summary

Advantages:

• Dramatic weight reduction (~2.9 kg) improves agility and balance.

• Clear mid‑range power gain (approx +2 hp / +2.5 Nm at lower revs).

• Aggressive, punchy sound that turns heads and boosts emotional ride quality.

• Solid construction with stainless steel and carbon details.

• Complete plug‑and‑play installation with included ECR—no ECU modifications required unless desired.

Limitations:

• Extremely loud—may exceed comfort or legal thresholds even with dB‑killer.

• Not road‑legal in many regions.

• Possibly tight fitment in some chassis variants—requires careful install.

• Warranty risk in emission‑regulated jurisdictions.

• ECR not needed if running aftermarket race map, but still included.

9. Ideal Suitability

• Track riders and weekend warriors craving maximum auditory and performance punch will find the S1 system compelling.

• Performance enthusiasts wanting uncompromising tone and weight savings for track days or circuit riding.

• Not recommended for commuters or riders living in noise-restricted urban environments unless sound limits can be assured.

10. Final Thoughts

The SC‑Project S1 Stainless Steel 2‑1 full exhaust for the Aprilia RS 457 (2024–2025) delivers a visceral experience: a raw, booming sound, meaningful power gains, and a substantial weight cut. Its aggressive styling and rich tone align perfectly with riders seeking bold expression.

While the deep sound is satisfying to many, the volume is extreme—even with the included baffle. Hearing protection is not optional—it’s mandatory for longer rides or frequent use. The plug‑and‑play nature and ECR module keep the installation tidy and reversible, while retaining ECU functionality without forced tuning—but pairing with a race map can extract better throttle response.