PRO CIRCUIT 4T00400-496 Silencer Slip

( Brand: Pro Circuit ), ( Manufacturer Part Number: 4T00400-496 ), ( Mounting Style: Slip-on ), ( Type: Muffler ), ( Placement On Vehicle: Exhaust )

Review PRO CIRCUIT Type 496 Slip on Silencer Ktm Exc fits 400 2003

The **Pro Circuit 4T00400-496 496 Slip-On Silencer** is a meticulously engineered aftermarket exhaust component designed exclusively for the **2003 KTM 400 EXC**, offering a perfect blend of performance enhancement and refined sound modulation. This high-quality slip-on silencer is crafted from **thick-walled, heat-treated stainless steel**, ensuring durability and resistance to corrosion, even under the demanding conditions of aggressive riding. The **496 slip-on** is engineered to replace the stock muffler with a more efficient and aggressive exhaust note, delivering a deeper, more resonant tone that retains a touch of sportiness while eliminating the harsh, tinny quality often associated with overly aggressive aftermarket exhausts. The design incorporates a **precision-machined internal baffling system**, which optimizes exhaust flow to maximize horsepower and torque while maintaining a balanced power delivery curve. This allows the **KTM 400 EXC** to breathe more freely, reducing backpressure and improving throttle response, particularly noticeable during aggressive acceleration and high-RPM scenarios. Beyond its performance benefits, the **Pro Circuit 496 slip-on** features a **sleek, low-profile design** that seamlessly integrates with the stock exhaust system, requiring minimal modifications and preserving the stock s aesthetic appeal. The silencer is also equipped with a **high-temperature coating** to prevent warping and ensure longevity, making it ideal for both track days and daily riding. Whether you're chasing a more aggressive exhaust tone, improving engine efficiency, or simply upgrading the stock setup for a more engaging ride, the **Pro Circuit 4T00400-496** is a reliable choice that delivers measurable performance gains without compromising reliability.

### **Pros and Cons of buying a Pro Circuit 4T00400-496 (496 Slip-On Silencer for 2003 KTM 400 EXC)**

1. **Improved Exhaust Note** The slip-on silencer enhances the engine s sound, giving it a deeper, more aggressive tone compared to the stock exhaust. This is often desirable for enthusiasts who want a more sporty or aggressive exhaust note.

2. **Better Flow and Horsepower Gains** Slip-ons are designed to improve exhaust backpressure, which can lead to slight performance improvements, particularly in throttle response and horsepower. For a 2003 KTM 400 EXC, this can make the bike feel more responsive, especially in mid-range power delivery.

3. **Easier Installation** Unlike full exhaust systems, slip-ons are relatively simple to install. They typically require minimal modifications, just a few bolts and possibly a new gasket. This makes them a cost-effective upgrade for those who want better sound without a full exhaust swap.

4. **Lightweight** Slip-ons are generally lighter than full exhaust systems, which can contribute to better handling and agility, especially on a bike like the KTM 400 EXC, which is already lightweight.

5. **Aesthetic Appeal** The Pro Circuit slip-on has a sporty, aggressive look that can improve the bike s appearance. The matte black finish is sleek and modern, making the bike stand out.

6. **Compatibility** This specific slip-on is designed for the 2003 KTM 400 EXC, ensuring a proper fit without the need for extensive modifications.

7. **Legal in Many Areas** Unlike some aftermarket exhausts that may exceed noise regulations, the Pro Circuit slip-on is often within legal limits for street use, depending on local laws.

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1. **Limited Performance Gains** While slip-ons improve exhaust tone and may offer slight horsepower gains, they are not as impactful as a full exhaust system or a full tune. Expect modest improvements rather than dramatic power increases.

2. **No Catalytic Converter or Emissions Compliance** If the bike is equipped with a catalytic converter (common in some markets), a slip-on alone may not be sufficient for emissions compliance. A full exhaust system with a proper cat-back setup may be required.

3. **Potential for Backfires** Improperly installed slip-ons or those with incorrect backpressure can lead to backfires, especially under hard acceleration. This can be annoying and may require tuning adjustments.

4. **Durability Concerns** Cheaper slip-ons can corrode or fail prematurely, especially if exposed to moisture or off-road use. The Pro Circuit brand is generally reliable, but it s still important to ensure proper maintenance.

5. **Noise Regulations** Even if the slip-on is legal in your area, some regions have strict noise laws. If the bike is used frequently in urban areas, excessive noise could lead to fines or complaints.

6. **No Full Exhaust Benefits** A slip-on does not address the entire exhaust system. If the stock muffler or pipes are worn or restrictive, the slip-on alone won t fully optimize performance. A full exhaust swap may be needed for significant gains.

7. **Cost vs. Full Exhaust** While slip-ons are cheaper than full exhaust systems, they may not offer enough of a performance boost to justify the cost for some riders. A full exhaust system could provide better overall improvements.

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The Pro Circuit 4T00400-496 slip-on silencer is a solid choice for riders who want to enhance the sound of their 2003 KTM 400 EXC without a full exhaust swap. It offers noticeable improvements in exhaust tone and slight performance gains, is easy to install, and looks great. However, it is not a comprehensive performance upgrade and may not be sufficient for riders seeking significant horsepower increases or emissions compliance.

If your primary goal is better sound and a minor performance boost, this slip-on is a worthwhile investment. If you re looking for a more substantial upgrade, a full exhaust system or a tune may be necessary. Additionally, always ensure the slip-on complies with local noise regulations to avoid legal issues.

- You want a deeper, more aggressive exhaust note.

- You prefer a simple, cost-effective upgrade.

- You re satisfied with minor performance improvements.

- The bike is used in areas where noise regulations allow it.

- You need significant horsepower gains (consider a full exhaust or tune).

- The bike requires emissions compliance (a full exhaust system may be needed).

- You plan to use the bike heavily in urban areas with strict noise laws.

- You want the most durable and performance-optimized exhaust setup (a full system may be better long-term).

Details:

E-Glass packing for excellent sound control and long life. Condition: Used but in good condition see pictures. Up for sale is a genuine Pro Circuit Type 496 slip-on muffler, part number 4T00400-496. This is the trail-friendly, 96 dB version designed specifically for early 2000KTM LC4 four-strokes.

Removable USFS-approved spark arrest included great for trail and forest riding. Key Features: Lightweight polished aluminum canister with stainless steel inlet, mid-pipe, and perforated core. Bolts directly onto the stock OEM head pipe slip-on only not for aftermarket full systems. 2003 KTM 400 EXC.

Modular end-cap design. Its ideal for endure, trail riding, dual-sport use, or areas with strict noise limits. Ready to bolt on and ride. Pro Circuit officially lists the 4T00400-496 Type 496 for these bikes.

Strong, durable mounting brackets. Comes with the spark arrest screen. Important Notes: Slip-on only requires stock head pipe.

part #: 4t00400496 price

• $547.00

specifications cyclemufflermo:

• for makes: Ktm
• for years: 2003
• brand: Pro Circuit
• mpn: 4t00400-496
• mounting style: Slip-on
• type: Muffler
• placement on vehicle: Exhaust

offer cyclemufflermo:

• started: March 24, 2026
• sold: 0
• best offers: True
• quantity: 1
• availability: In Stock
• options: Ship-to-home

returns cyclemufflermo:

• policy: No Returns

seller cyclemufflermo:

• rating: 100.0%
• city: Kooskia, Idaho
• # reviews: 445

general cyclemufflermo:

• Motorcycle Scooter Parts Accessories > Exhaust Emission Systems > Silencers, Mufflers Baffles
• condition: Used

payments cyclemufflermo:

• other
• credit card: Diners-club
• wallet: Paypal

shipping cyclemufflermo:

• class: Standard
• type: Calculated
• transit: 3-9 Days
• carrier: USPS
• service: USPS Ground Advantage
• cost: $31.30

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