The Stainless Bros' 3D-printed 4-to-1 merge collector is precision-crafted from SS316 stainless steel using advanced metal additive manufacturing. The internal transition and collector geometry are optimized through fluid-dynamic modeling to minimize turbulence, increase pulse energy, and maximize overall exhaust efficiency—all within an ultra-compact package.
Designed around an ideal 15° merge angle, this collector hits the proven “sweet spot” for power: the shortest practical transition length while maintaining high exhaust velocity and low drag. The result is a highly efficient pulse-merging effect that supports strong mid-range torque and top-end power gains.
If you’re searching for a billet merge collector or CNC billet collector, this advanced 3D-printed stainless steel merge collector represents the next evolution in collector design. While traditional billet collectors are limited by CNC machining and straight-line tool paths, additive manufacturing enables complex internal geometries that billet collectors simply cannot achieve. The result is smoother internal transitions, improved exhaust scavenging, reduced flow separation, and higher overall efficiency compared to conventional billet collectors.
These are engineered to slip over 16-gauge SS304 tubing from Stainless Bros. SS304/SS321 tubing and bends which ensures a seamless fit-up.
Total Overall Length:
2" Primary to 3" Outlet - 5.4" OAL
2" Primary to 3.5" Outlet - 4.4" OAL
