ll of our in-house exhaust manifolds are CAD designed, entirely stainless steel (including ALL flanges), back purged, and TIG welded by hand in our facility in BC, Canada.  Careful consideration for runner length, collector design, orientation, wastegate placement, and turbine flow characteristics ensure optimal performance.  All of our Spectrum Motorsports RB exhaust manifolds are equal length, delivering an enjoyable exhaust sound and even exhaust pulse delivery. 

Our twin-scroll RB manifold utilizes a unique arrangement for both merge collectors, allowing for significantly shorter runner length, and lower pre-turbine volume than other equal length manifolds.  This results in the best match for mid-frame twin-scroll T4 turbines, with fantastic torque and "area under the curve". This design has been updated to use an investment-cast stainless collector assembly to improve wastegate flow characteristics and ensure the best reliablity possible.

Our line-up of RB25 and RB26 manifolds allows for adaptation to your turbocharger and wastegate of choice.  Built with a merge collector for single volute turbines, or a divided collector orientation and dual wastegates for twin-scroll turbines. 

All Fabricated Components are sold with a 5 Year Warranty against cracking or defects, and our record speaks for itself with 0 failures on these manifolds over 8 years of production.