Straightline Performance Arctic Cat Thundercat 9000 Yamaha Sidewinder SRX 998 Header
Straightline Performance Arctic Cat Thundercat 9000 Yamaha Sidewinder SRX 998 Header is backordered and will ship as soon as it is back in stock.
Shipping & delivery
Usually ships in 2–3 business days unless a different lead time is shown on this page. Shipping cost is calculated at checkout (UPS or USPS to the contiguous U.S.).
Shipping policy · Returns · Fitment questions? (561) 207-7988
Delivery and Shipping
Delivery and Shipping
Standard order processing is 2–3 business days unless this product or your order confirmation states a different lead time. Custom-built, made-to-order, backorder, and pre-order items follow their stated lead times.
Enclosures and subwoofer boxes ship for $50 per unit. Other shipping charges are calculated at checkout. Orders outside the contiguous 48 United States may require additional shipping; we will contact you for approval before shipment.
Subwoofer boxes ship UPS Ground where available. Read our Shipping Policy and Return and Refund Policy for delivery, product-specific return windows, and warranty details.
Straightline Performance Arctic Cat Thundercat 9000 Yamaha Sidewind...
Straightline Performance Arctic Cat Thundercat 9000 Yamaha Sidewinder SRX 998 Header is backordered and will ship as soon as it is back in stock.
Description
Description
This full stainless steel header is a direct bolt-on upgrade for 2017-current Arctic Cat Thundercat 9000 and Yamaha Sidewinder / SRX 998 Turbo snowmobiles, delivering a proven 15 horsepower gain along with increased torque and faster turbo spool. Precision TIG-welded and designed to retain all factory heat shields, it keeps the OEM look while improving exhaust flow and heat management.
It works great on stock sleds but really wakes up when paired with aftermarket ECU tunes, intakes, exhaust systems, and clutch kits—no cutting or fabrication required, though a proper clutch calibration is highly recommended to make the most of the extra power.
| Brand | Straightline Performance |
| Product Type | Performance Exhaust Header |
| Material | Stainless Steel |
| Compatibility | 2017-Current Arctic Cat Thundercat 9000; Yamaha Sidewinder 998 Turbo; Yamaha SRX 998 Turbo |
| Installation | Direct bolt-on; retains factory heat shields; no cutting or fabrication required |
| Performance Gain | Proven 15 horsepower gain |
| Weight | 13 lbs |
| Dimensions | 25 × 13 × 11 in |
| Kit Includes | Stainless Steel Performance Header, Installation Instructions |
Fitment & installation
Fitment & installation
Check the selected part against your vehicle. Need help? Call (561) 207-7988.
Selected part: 133-107
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Read FOX’s application notes for part 987-24-001 (rear shock)
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