Vibrant Performance 10303 4-1 Merge Collector 1.75" Inlet 3.50" Outlet T304 16ga

Vehicle Fitment

• Universal - compatible with any custom header or exhaust fabrication requiring a 4-into-1 merge collector with 1.75" I.D. slip-over primary tube inlets and a 3.50" O.D. outlet

Fitment Notes

• Universal fitment - not vehicle-specific; designed for custom header fabrication where primary tubes have a 1.75" O.D. (slip into the 1.75" I.D. collector inlets)
• Sold individually as a single collector - purchase two for a dual-exhaust or twin-collector application
• Outlet is 3.50" O.D. transition cone; pair with 3.00" I.D. exhaust piping at the merge section or size to the transition cone for connection to the exhaust system
• Not CARB legal - intended for off-road or race use; verify emissions compliance for your application

Features

• 4-into-1 merge collector design maximizes exhaust scavenging efficiency by combining exhaust pulses from all four primary tubes at a precision-engineered merge point, reducing backpressure and improving power across the RPM range
• Complete 16-gauge T304 stainless steel construction for superior heat resistance, corrosion resistance, and long-term durability in high-exhaust-temperature environments
• Back-purged TIG welds at every seam ensure full penetration and leak-free integrity throughout the collector body
• Hand-ported interior removes weld bead intrusions and sharp transitions for smooth, unrestricted exhaust gas flow through the collector
• 2-year limited warranty

Specifications

• Part Number: 10303
• Product Name: 4-into-1 Merge Collector
• Configuration: 4-into-1
• Inlet Style: Slip-over (primary tubes slip into collector)
• Inlet I.D.: 1.75" (suits 1.75" O.D. primary tubes)
• Merge Section O.D.: 3.00"
• Transition Cone Outlet O.D.: 3.50"
• Overall Length: 9.37"
• Wall Thickness: 16 gauge
• Material: T304 stainless steel
• Weld Type: Back-purged TIG, all seams
• Interior Finish: Hand-ported
• Warranty: 2-year limited
• Quantity: Sold individually

Included Components

• 1x Vibrant Performance 4-into-1 Merge Collector - 1.75" Inlet / 3.50" Outlet, T304 Stainless (10303)

Product Description

The Vibrant Performance 10303 is a 4-into-1 merge collector designed for custom header and exhaust fabrication using 1.75" O.D. primary tubes. Built from 16-gauge T304 stainless steel with back-purged TIG welds at every seam and a hand-ported interior, it delivers the precision construction and smooth internal geometry necessary for maximum exhaust scavenging efficiency. The merge collector design concentrates exhaust pulses from all four primary tubes at a single point, creating a low-pressure zone that actively draws spent gases out of the cylinders - a measurable performance advantage over conventional collectors at both mid-range and peak RPM.

The 1.75" I.D. slip-over inlets accept 1.75" O.D. primary header tubes, while the 3.50" O.D. transition cone outlet connects to the downstream exhaust system. Overall length of 9.37" keeps the merge collector compact for tight engine bay installations. Sold individually - two are required for V8 equal-length or Tri-Y header configurations with dual collectors. Backed by Vibrant Performance's 2-year limited warranty.