Borla Universal XR-1 Sportsman Shorty Racing 3.5-Inch Center Inlet / Center Outlet Polished T-304 Stainless Steel Round Compact Muffler (40004S)
Unlock ultimate exhaust flow and aggressive acoustic tuning with the Borla Universal XR-1 Sportsman Shorty Racing Muffler. Masterfully engineered to meet the demanding requirements of high-horsepower track setups, race cars, performance trucks, and customized SUVs, this high-efficiency unit utilizes a bidirectional center-in and center-out 3.5-inch configuration. At its mechanical core, this premium racing muffler breaks away from restrictive traditional baffle layouts by incorporating Borla’s cutting-edge straight-through internal geometry. This innovative layout features a high-flow internal network that maintains an uncompromised path for thermal gas exit, generating an excellent scavenger effect. This advanced aerodynamic design maximizes peak horsepower, expands torque delivery, and completely eliminates backpressure bottlenecks for high-displacement or forced-induction engines.
The structural engineering of the Borla 40004S addresses long-term durability and installation problems beneath harsh track and street conditions through a 100% welded, heavy-gauge setup. Enclosed in an ultra-compact 5-inch round by 8-inch long barrel case with a total 13-inch overall footprint, this robust assembly delivers excellent space optimization when tucked into tight under-car zones, narrow transmission tunnels, custom driveshaft loops, or crowded truck frames. The specialized shorty body layout packs a massive volume of advanced, high-temperature Continuous-Filament Fiber (CFF) acoustic sound control packing. This advanced insulation filters out high-frequency rasp and annoying highway cabin drone while preserving a raw, unrestrictive mechanical tone under full throttle. Built completely from aircraft-quality, premium-grade T-304 austenitic stainless steel finished in a natural mill texture with un-notched neck bases, this heavy-duty canister features no raw brand embossing for a completely clean, stealthy aesthetic. Capable of being flipped or reverse-mounted due to its completely uniform, reversible internal configuration, this elite USA-made performance component delivers bulletproof structural stability backed by Borla’s legendary Million-Mile warranty.
Ultra-Compact Shorty Racing Architecture: Engineered specifically for race platforms with severe clearance limits, this performance muffler packs premium straight-through flow dynamics into a compact 8-inch case shell. The un-embossed exterior body allows custom car builders to retain a sleek, completely covert under-chassis look, while the high-density internal insulation ensures structural integrity and uniform sound dampening under intense thermal heat cycles.
Fabrication Installation Guideline Note: This high-performance universal muffler is built with smooth, un-notched attachment necks engineered for permanent weld-on workshop connection. If your project demands a removable mechanical configuration instead of a fixed weld joint, the smooth connection collars can easily accommodate heavy-duty, wide two-bolt style band clamps (clamps not included).
Features
- Ultra-Compact Shorty Configuration: Mini 5" round x 8" long case layout slides cleanly into extremely tight under-car zones and custom racing chassis tracks
- High-Flow Straight-Through Core: Maximum-flow interior design completely eliminates power-robbing backpressure to unleash peak horsepower and torque
- Premium Continuous-Filament Fiber: Packed with high-temp CFF insulation to absorb harsh acoustic frequencies while maintaining a deep, muscular tone
- Smooth Un-Notched Neck Bases: Engineered explicitly for clean, high-strength welding or simple adaptation with heavy-duty wide band clamps
- Stealthy Un-Embossed Outer Casing: Clean exterior barrel features no raw logo stamps, providing a perfectly smooth, uniform look for custom fabrications
- 100% Symmetrical Reversible Layout: Bidirectional configuration provides ultimate fabrication flexibility, allowing it to be installed in either direction
- Constructed completely from premium-grade T-304 austenitic stainless steel for permanent structural integrity and ultimate rust resistance over low-grade 400-series hardware options
- Proudly Manufactured in the USA: Built in America by the world’s most experienced exhaust brand to guarantee flawless fitment and elite race-proven quality
Detailed Fitment Breakdown
Universal Application Parameters & Structural Boundaries:
This premium universal XR-1 Sportsman racing muffler is compatible with a massive array of custom and production vehicle platforms under the specific architectural parameters detailed below:
Universal Automotive & Custom Exhaust Fabrication Fitment:
- Integrates seamlessly into any custom aftermarket or race-spec exhaust line running large-bore 3.5-inch piping
- Sized perfectly for tight-clearance single or dual muffler layouts on high-output trucks, performance SUVs, muscle cars, and dedicated track vehicles
- Highly recommended for high-horsepower street/strip machines, circle track racing, or forced-induction configurations requiring zero flow restriction
- Compatible across all domestic and import car, truck, and SUV platforms with sufficient clearance for a 5" round body footprint
Sizing, Connection & Dimensional Details:
Fits your project layout across these exact structural specifications:
- Inlet / Outlet Connection Size: 3.50-Inch internal diameter centered neck configurations
- Muffler Case Configuration: 5.00-Inch traditional round structural barrel shape
- Muffler Case Body Length: 8.00 Inches of primary sound suppression coverage
- Overall Muffler Total Length: 13.00 Inches from inlet tip to outlet tip boundary
- Internal Architecture Matrix: Straight-through high-flow race configuration with CFF sound material
- Material Grade Composition: Authentic T-304 Austenitic Stainless Steel with a natural mill finish
Important Application Notes:
- **Premium Materials:** Built entirely with authentic T-304 stainless steel to deliver superior rust resistance and durability over lower-grade T-400 series or aluminized hardware choices.
- **Versatile Fabrication Paths:** Engineered as a professional universal raw component requiring specialized cutting and welding modifications, providing custom fabricators with a dependable, heavy-walled material block that stands up to severe track heat cycles without fracturing.
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