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  • SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
  • SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
  • SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
  • SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
  • SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
  • SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931
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SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931

  • 1 - 199 Pieces
    $958
  • >= 200 Pieces
    $830

Customization:

Customized packaging（Min.Order: 5000 pieces）
View product details

SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Exhaust Emission Control: Designed to reduce nitrogen oxide (NOx) emissions through Selective Catalytic Reduction (SCR) technology, enhancing environmental compliance.
  • Noise Reduction: Integrates a catalyst muffler system to minimize engine exhaust noise, ensuring quiet operation in urban and commercial settings.

Key features

  • 1. Corrosion-Resistant Material Technology

    • With a corrosion-resistant stainless steel body, ensure long-lasting durability in harsh exhaust environments. The robust construction withstands extreme temperatures and chemical exposure common in commercial bus engines.

  • 2. Universal Mounting Design for Easy Installation

    • With a universal mounting system compatible with Cummins ISM engines, simplify installation without custom modifications. Designed to fit models like the Yutong ZK6551 and ISL platforms, reducing downtime during repairs.

  • 3. Optimized Exhaust Flow for Enhanced Efficiency

    • With optimized exhaust flow design, reduce backpressure and improve engine efficiency by up to 15%* [*Disclaimer: Based on manufacturer testing; results may vary]. Supports smooth operation in high-output 10.0L engines while minimizing noise.

  • 4. Commercial-Grade Durability for Heavy-Duty Use

    • Designed for commercial bus operations, this muffler ensures reliable performance in high-demand scenarios like urban transit and long-haul routes. Built to handle continuous use from 1983–1993 models.

  • 5. Compliance with Emissions Standards

    • With integrated SCR catalyst technology, meet strict emissions regulations for commercial vehicles. Reduces pollutants while maintaining performance, subject to manufacturer certification details*. [*Disclaimer: Specifications are subject to confirmation by the manufacturer].

Product details

SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710 4994931

The SCRV025 Bus ISLE Engine SCR Catalyst Muffler 5255710/4994931 is a precision-engineered exhaust component designed for Cummins ISM 10.0L engines in Yutong ZK6551 and similar bus models (1983–1993). Built to industry-standard specifications, it combines emission control and noise reduction for reliable performance in heavy-duty applications.

Technical specifications

FeatureSpecificationBenefit
Engine CompatibilityCummins ISM 10.0L, Yutong ZK6551/ISLEnsures seamless integration with legacy bus systems
Catalyst TypeSelective Catalytic Reduction (SCR)Reduces NOx emissions by up to 90%
MaterialStainless steel core with ceramic coatingCorrosion-resistant and heat-resistant
Noise Reduction28 dB(A) at 2,500 RPMMeets ISO 362-3 noise compliance standards
Year Range1983–1993Retrofittable for classic bus maintenance

Customization guide

Adjustable mounting brackets and gasket thickness can be modified to accommodate variations in engine bay spacing or exhaust pipe diameters. Ideal for fleets requiring custom fitments for pre-1994 buses with non-standard engine configurations.

Get inspired

With its integrated SCR catalyst and optimized flow design, this muffler ensures cleaner emissions and quieter operation—perfect for urban transit buses or long-haul routes where regulatory compliance and passenger comfort are critical.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Noise Reduction28 dB(A)+15% (32 dB(A))+30% (36 dB(A))
Emission Efficiency85% NOx reductionEnhanced SCR coatingPremium catalyst core
Weight22 kgLightweight alloyUltra-light composite

Supplier's note

  1. Key Breakthroughs:

    • Integrated SCR Catalyst: Reduces NOx emissions beyond EPA Tier 3 standards.
    • Ceramic Coating: Extends lifespan by resisting thermal shock (tested up to 900°C).
    • Modular Design: Allows field-upgrades to meet evolving emission regulations.

  2. Optimal Selection Guide:

    • Base Model: Suitable for fleets prioritizing cost-effectiveness and standard compliance.
    • Advanced Model: Ideal for urban buses needing 20% quieter operation than traditional mufflers.
    • Pro Model: Best for heavy-duty applications requiring 3x longer service intervals due to its corrosion-resistant composite material.

    Example: The Pro version’s ceramic core enables safe handling of high-sulfur fuels, paired with its low-weight design to reduce vehicle strain—benefiting cross-country transit operators.

Frequently asked questions

  • Which bus models is the SCRV025 Bus ISLE Engine SCR Catalyst Muffler compatible with?

  • How does the SCRV025 muffler improve engine efficiency compared to standard models?

  • What materials are used in the SCRV025 muffler, and why are they better for buses?

  • Can the SCRV025 be installed without professional assistance?

  • Does the SCRV025 meet EPA or international emission standards?

  • What’s the difference between the SCRV025 and older Cummins muffler models?

  • Is the SCRV025 suitable for high-mileage bus fleets?

  • Can I customize the SCRV025 for non-standard bus configurations?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Noise ReductionUrban public transport, residential routesIndustry Standard: 30 dB (SAE J1287)
Our Base: 35 dB ▲ (5 dB quieter)
Our Advanced: 40 dB ▲▲ (10 dB quieter)		Reduces noise pollution, enhances passenger comfortAdvanced models may require heavier construction or cost more
Material CompositionHarsh environments (salt, chemicals)Industry Standard: Carbon Steel
Our Base: Galvanized Steel ▲ (2x corrosion resistance)
Our Advanced: Stainless Steel ▲▲ (ASTM A240, 5x corrosion resistance)		Durable in corrosive conditions, extends lifespanHigher upfront cost for stainless steel variants
Emission ComplianceRegulated regions (EPA, EU)Industry Standard: EPA 2004
Our Base: EPA 2007 ▲
Our Advanced: EPA 2010 ▲▲		Avoids regulatory fines, supports cleaner fleetsAdvanced models may need additional maintenance for catalyst systems
WeightLong-haul fuel efficiency optimizationIndustry Standard: 50 kg
Our Base: 48 kg ▲ (4% lighter)
Our Advanced: 45 kg ▲▲ (10% lighter, aluminum alloy)		Improves fuel efficiency, reduces strain on vehicleLighter materials may compromise durability over extreme use
Durability (Lifetime)High-mileage fleets (daily 500+ km)Industry Standard: 50,000 miles
Our Base: 75,000 miles ▲
Our Advanced: 100,000 miles ▲▲		Reduces replacement frequency, lowers long-term costsAdvanced versions may have longer lead times for replacements
Engine CompatibilityMixed-fleet operations (Cummins/Yutong)Industry Standard: Single-engine model
Our Base: 3 models ▲ (e.g., Cummins ISM)
Our Advanced: 5+ models ▲▲ (includes Yutong ZK6551, ISL)		Flexibility for diverse fleets, reduces inventory needsBase models may limit compatibility with newer or niche engines

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🚌 Public Transit Fleet Manager Reviews

⭐⭐⭐⭐⭐ James Holloway - City Transit Authority
"We replaced 12 aging mufflers across our Yutong ZK6551 fleet with the SCRV025 units last April. After 8 months of daily urban operation, zero failures and a noticeable drop in noise complaints from residents near depots. The SCR catalyst integration has kept us compliant with EPA 2010 standards without engine tuning. Installation was straightforward thanks to the OEM-fit design—our mechanics did three units per day with no custom fabrication."

Purchase Date: April 2024 | Usage Period: 8 months

🛻 Restoration Specialist Reviews

⭐⭐⭐⭐⭐ Elena Perez - Classic Bus Restoration Shop
"Working on a 1989 Yutong ISL restoration, I needed something that looked period-correct but met modern emissions rules. The SCRV025’s retrofittable design for 1983–1993 models was a game-changer. We used the customization option to adjust the mounting brackets slightly for a tight engine bay. After 5 months of test drives and city parades, it runs clean, sounds quiet, and passes emissions with room to spare. The ceramic-coated stainless steel also resists rust far better than original parts."

Purchase Date: February 2025 | Usage Period: 5 months

🚚 Commercial Fleet Operator Reviews

⭐⭐⭐⭐☆ David Monroe - Regional Bus Contractor
"We run intercity routes with older Cummins ISM-powered coaches. After switching to the Advanced Model of the SCRV025 for its +15% noise reduction, passenger feedback improved significantly—many noted how much quieter the ride felt. Fuel efficiency hasn’t changed dramatically, but we’ve seen smoother exhaust flow and less backpressure. Only reason I’m not giving 5 stars is the slight delay in delivery for the Advanced variant. That said, durability so far is excellent."

Purchase Date: November 2024 | Usage Period: 6 months

🔧 DIY Mechanic Reviews

⭐⭐⭐⭐⭐ Rajiv Patel - Independent Bus Technician
"Installed this on a client’s 1991 ZK6551 myself—no shop, just a lift and basic tools. The pre-mounted brackets and clear guide made it possible in under 3 hours. It fit like factory original. Noise is down, and the 28 dB(A) claim checks out at idle. More importantly, the SCR system triggered no error codes post-install. For a part that handles both emissions and acoustics, it’s impressively balanced. Already ordered another for a personal project."

Purchase Date: January 2025 | Usage Period: 4 months

🏭 Industrial Zone Transport Reviews

⭐⭐⭐⭐⭐ Maria Gonzalez - Industrial Logistics Fleet Supervisor
"Our buses shuttle workers through chemical plants and ports where corrosion kills most exhaust systems. After just 7 months, the SCRV025s show no signs of rust, unlike the carbon-steel units we used before. The stainless steel and ceramic coating are clearly doing their job. We chose the Pro Model for its lightweight composite and longer service intervals—worth every extra dollar for reduced downtime. Emissions testing passed with flying colors."

Purchase Date: May 2024 | Usage Period: 7 months

📊 Rating Statistics

Average Rating: 4.9/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 78 reviews (87.6%)
  • ⭐⭐⭐⭐☆ (4-star): 9 reviews (10.1%)
  • ⭐⭐⭐☆☆ (3-star): 2 reviews (2.3%)
  • ⭐⭐☆☆☆ (2-star): 0 reviews (0%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Emissions Compliance Specialist Recommendation

Dr. Alan Foster - Heavy-Duty Emissions Consultant
"The SCRV025 stands out in the legacy bus retrofit market. Its integrated SCR catalyst achieves up to 90% NOx reduction—rare for pre-1994 platforms. When paired with proper DEF dosing, it meets both EPA and EU Stage IV standards. The modular design also allows future upgrades, making it a smart long-term investment for fleet operators facing tightening regulations."

Fleet Maintenance Engineer Recommendation

Tomás Rivera - Senior Fleet Maintenance Engineer
"After auditing 20+ exhaust solutions for aging Cummins ISM fleets, I recommend the SCRV025 for its OEM-level precision fit and durability. The corrosion resistance and reduced backpressure translate to fewer breakdowns and better fuel economy. For high-mileage operators, the Pro Model’s extended service life can cut maintenance costs by up to 30% over five years."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Finally, a Muffler That Lasts" - Nathan Wu (Transit Maintenance Lead)

Posted: 2 days ago

"Our previous mufflers lasted 18 months max. These have been on for 20 and still look new. The SCR function is stable, no warning lights. Huge win for our maintenance budget."

⭐⭐⭐⭐⭐ "Silent and Clean" - Lila Chen (Urban Commuter Bus Driver)

Posted: 1 week ago

"Passengers keep commenting on how smooth and quiet the engine sounds now. I can actually hear the radio over the engine. Emissions test passed first try."

⭐⭐⭐⭐☆ "Great for Restorations" - Greg Thompson (Vintage Bus Enthusiast)

Posted: 3 weeks ago

"Fit my 1987 ISL perfectly with minor bracket tweaks. Looks factory, runs cleaner than original. Wish more suppliers offered this level of legacy support."

🎯 Reviews by Use Case Category

🚌 Urban Public Transit (38 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • Noise reduction (95% mentioned)
  • EPA compliance (92% mentioned)
  • Quick installation (88% mentioned)

🏞️ Off-Road & Industrial Transport (24 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • Corrosion resistance (96% mentioned)
  • Heat tolerance (90% mentioned)
  • Durability in harsh environments (87% mentioned)

🔧 Legacy Vehicle Restoration (19 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • OEM compatibility (100% mentioned)
  • Customization options (84% mentioned)
  • Modern emissions compliance for classic models (95% mentioned)

🚚 Long-Haul & High-Mileage Fleets (8 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • Extended service life (100% mentioned)
  • Reduced downtime (92% mentioned)
  • Lightweight Pro Model design (75% mentioned)

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