FMF Exhausts
Factory 4.1 RCT Exhaust Silencer 09-11 Kawasaki KX 450 F - FMF 042291
Factory 4.1 RCT Exhaust Silencer 09-11 Kawasaki KX 450 F - FMF 042291
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The Factory 4.1 RCT Stainless SL Slip-On with Carbon End Cap delivers advanced performance with FMF’s Resonance Chamber Technology™, optimising power output and mass centralisation for professional-level racing. Built from top-tier aerospace grade materials at FMF’s Southern California facility, this slip-on exhaust offers substantial weight savings, improved crash resilience and the latest Rapid Tuning System for seamless adjustments. Its precise engineering ensures reduced overall length and an optimally positioned muffler for enhanced handling and durability.
Features
- Incorporates both internal and external FMF Resonance Chamber Technology™
- Shorter, forward-positioned muffler design for centralised mass and reduced crash vulnerability
- Constructed from aerospace grade aluminium and stainless steel with carbon fibre end cap
- Massive power gains across the RPM range
- Significant weight reduction over stock systems
- Includes Rapid Tuning System (RTS) for quick adjustments
- Natural aluminium finish with carbon end cap for strength and style
- Screen-type spark arrestor insert and 94dB quiet insert included
- Manufactured 100% in FMF’s Southern California factory
- For closed course competition use only
Specifications
- Item ID: 042291
- Type: Slip-On
- Configuration: Single
- Construction: Aluminium
- Finish: Natural
- Midpipe: Stainless steel
- Endcap: Carbon fibre
- Spark Arrestor: Screen insert (included)
- Quiet Insert: 94dB insert (included)
- Weight: 5 lbs (approximate)
- Carb Warning: No
Vehicle Fitment
Kawasaki
- KX450F (2009–2011)
Shipping Policy
Shipping Policy
Order Processing and Delivery Schedule
Once an order is placed on our website, it enters our dispatch queue promptly.
Order Handling Time: 1 business day (Monday to Friday)
Order Cut-Off Time: 04:00 PM (GMT+00:00) Greenwich Mean Time (London)
Orders placed after the cut-off time will be processed on the next working day.
Standard Shipping Transit Time
Transit Time: 2-3 business days (Monday to Friday)
Total Shipping Time (Handling + Transit)
Estimated Delivery Window: 3-5 business days (Monday to Friday)
Shipping Carrier
We partner with trusted UK couriers such as Royal Mail, DPD, DHL, and Parcelforce. The carrier used for your order will be confirmed in your dispatch email.
Shipping Locations
We currently ship within the United Kingdom only.
Shipping Fees
We offer free shipping on all orders of £50 or above.
For orders below £50, a flat rate of £3.99 will be applied at checkout.
Please NOTE that extra shipping fees will be charged on all tyres & electric bikes due to size / weight.
All prices are charged in GBP (£).
Order Confirmation and Tracking
Once your order is placed, you will receive an order confirmation email. After dispatch, a shipping confirmation email with a tracking number and tracking link will be provided. A final notification will be sent when your order is marked as delivered.
Lost or Missing Packages
If your parcel is marked as delivered but has not arrived:
Reconfirm the delivery address
Check surrounding areas or safe delivery spots
Ask neighbours or household members
Contact the courier with your tracking details
If your parcel is officially classified as lost, please contact us with your order number. We will arrange a replacement or refund, depending on your preference.
Delivery Delays
While we aim to meet all estimated delivery times, delays may occasionally occur due to courier disruptions or high seasonal volume. If your order has not arrived within the expected timeframe, contact us for support.
Refund and Return Policy
Refund and Return Policy
Return Window and Eligibility
Returns are accepted within 30 days of delivery, provided the following conditions are met:
Items must be new, unused, and in their original packaging with all accessories included.
Returns are accepted for both defective and non-defective products.
Customers must contact us before sending any return to receive return approval and instructions.
Email: sales@aceraceshop.co.uk
Phone: +44 1282216785
Damaged or Defective Items
If your order arrives damaged or defective, please notify us within 48 hours of delivery with:
Your order number
Clear photographs of the item and packaging
A brief description of the issue
Depending on the situation, we will offer a replacement, exchange, or full refund.
Exchanges
We accept exchanges within 30 days, provided the returned item meets the eligibility criteria stated above. Once the returned product is received and inspected, your replacement item will be dispatched.
Refund Process
Once we receive and inspect your return, you will be notified via email regarding the approval or rejection of your refund.
If approved:
Refunds will be processed to your original payment method within 7 days.
A confirmation email will be sent once the refund has been issued.
Late or Missing Refunds
If you haven’t received your refund:
Recheck your bank or payment account
Contact your bank or card provider—processing times may vary
If you still require assistance, reach us at sales@aceraceshop.co.uk
Non-Returnable Conditions
We do not accept returns under the following circumstances:
Items not returned in new condition
Returns requested after 30 days of delivery
Items sent back without prior authorization
Return Address
Ace Race Shop
Smithsons Farm Cottage
Burnley BB12 9DR
United Kingdom
Method & Fees
Return Method: By mail
Return Label: Customer is responsible for arranging and paying for return shipping
Restocking Fee: No cost
Refund Processing Time: 7 days after receipt of return
Cancellation Policy
Orders may be cancelled within 2 hours of purchase, provided the order has not yet been processed or shipped.
