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Important - Off-Road Use Only: This exhaust is supplied for off-road / closed-course use only and is not approved for use on public roads unless clearly stated otherwise.
It is the customer's responsibility to ensure the product is suitable and compliant for their intended use, including any applicable UK/EU noise and emissions requirements and any vehicle type-approval requirements.
Please note: Some images may be for illustrative purposes only.
-
Important - Off-Road Use Only: This exhaust is supplied for off-road / closed-course use only and is not approved for use on public roads unless clearly stated otherwise.
It is the customer's responsibility to ensure the product is suitable and compliant for their intended use, including any applicable UK/EU noise and emissions requirements and any vehicle type-approval requirements.
Please note: Some images may be for illustrative purposes only.
Product description
The R-304 Silencer is part of the latest collection from Pro Circuit.
Features:
- Full-race two-stroke silencer
- The compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing only
- Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer
- 304 stainless steel intake tube
- Double-walled mounting bracket(s)
- Tig and mig welded for strength and durability
- E-Glass internal packing for maximum packing life
- Made in the USA
Specifications:
- Color/Finish: Aluminum| Brushed
- End Cap Style: Conical
- Material: Stainless Steel| T-6 Aluminum
- Model: R-304
- Product Name: Silencer
- Style: Round
- Type: Slip-On Silencer
To fit:
- KTM SX 105 2004 All Models
- KTM SX 105 2006 All Models
- KTM SX 105 2007 All Models
- KTM SX 105 2008 All Models
- KTM SX 85 17/14 2004 All Models
- KTM SX 85 17/14 2005 All Models
- KTM SX 85 17/14 2006 All Models
- KTM SX 85 17/14 2007 All Models
- KTM SX 85 17/14 2008 All Models
- KTM SX 85 19/16 2004 All Models
- KTM SX 85 19/16 2005 All Models
- KTM SX 85 19/16 2006 All Models
- KTM SX 85 19/16 2007 All Models
- KTM SX 85 19/16 2008 All Models
Manufacturer part number: ST04085-RE
View all Pro Circuit Exhausts. View all Exhausts.
Contents
Your package will include the following:
- 1 X Pro Circuit R-304 Silencer For KTM SX85 B/W
To fit:
- KTM SX 105 2004 All Models
- KTM SX 105 2006 All Models
- KTM SX 105 2007 All Models
- KTM SX 105 2008 All Models
- KTM SX 85 17/14 2004 All Models
- KTM SX 85 17/14 2005 All Models
- KTM SX 85 17/14 2006 All Models
- KTM SX 85 17/14 2007 All Models
- KTM SX 85 17/14 2008 All Models
- KTM SX 85 19/16 2004 All Models
- KTM SX 85 19/16 2005 All Models
- KTM SX 85 19/16 2006 All Models
- KTM SX 85 19/16 2007 All Models
- KTM SX 85 19/16 2008 All Models

Pro Circuit is a renowned brand in the motocross and motorcycle racing industry. Specializing in high-performance exhaust systems, suspension components, and accessories, Pro Circuit has been a dominant force since 1978. Their cutting-edge products are favored by professional riders, earning the brand widespread acclaim for innovation and reliability in motorsports.
Product description
The R-304 Silencer is part of the latest collection from Pro Circuit.
Features:
- Full-race two-stroke silencer
- The compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing only
- Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer
- 304 stainless steel intake tube
- Double-walled mounting bracket(s)
- Tig and mig welded for strength and durability
- E-Glass internal packing for maximum packing life
- Made in the USA
Specifications:
- Color/Finish: Aluminum| Brushed
- End Cap Style: Conical
- Material: Stainless Steel| T-6 Aluminum
- Model: R-304
- Product Name: Silencer
- Style: Round
- Type: Slip-On Silencer
To fit:
- KTM SX 105 2004 All Models
- KTM SX 105 2006 All Models
- KTM SX 105 2007 All Models
- KTM SX 105 2008 All Models
- KTM SX 85 17/14 2004 All Models
- KTM SX 85 17/14 2005 All Models
- KTM SX 85 17/14 2006 All Models
- KTM SX 85 17/14 2007 All Models
- KTM SX 85 17/14 2008 All Models
- KTM SX 85 19/16 2004 All Models
- KTM SX 85 19/16 2005 All Models
- KTM SX 85 19/16 2006 All Models
- KTM SX 85 19/16 2007 All Models
- KTM SX 85 19/16 2008 All Models
Manufacturer part number: ST04085-RE
View all Pro Circuit Exhausts. View all Exhausts.
Contents
Your package will include the following:
- 1 X Pro Circuit R-304 Silencer For KTM SX85 B/W
To fit:
- KTM SX 105 2004 All Models
- KTM SX 105 2006 All Models
- KTM SX 105 2007 All Models
- KTM SX 105 2008 All Models
- KTM SX 85 17/14 2004 All Models
- KTM SX 85 17/14 2005 All Models
- KTM SX 85 17/14 2006 All Models
- KTM SX 85 17/14 2007 All Models
- KTM SX 85 17/14 2008 All Models
- KTM SX 85 19/16 2004 All Models
- KTM SX 85 19/16 2005 All Models
- KTM SX 85 19/16 2006 All Models
- KTM SX 85 19/16 2007 All Models
- KTM SX 85 19/16 2008 All Models

Pro Circuit is a renowned brand in the motocross and motorcycle racing industry. Specializing in high-performance exhaust systems, suspension components, and accessories, Pro Circuit has been a dominant force since 1978. Their cutting-edge products are favored by professional riders, earning the brand widespread acclaim for innovation and reliability in motorsports.






























