RB25 | RB26 Exhaust Manifold

All 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.

Our current fabrication lead time for non-inventory items is 2-4 weeks.  Please email info@spectrummotorsportssolutions.com for more information.

Please note that the Artec Performance RB26 Investment-Cast Exhaust Manifold is only suitable for reverse rotation turbochargers.

All prices are listed in USD.  

All orders are shipped from our shop located in BC, Canada.

International shipments may be subject to customs duties, taxes, and/or tariffs which are based on recipient shipping location and are not included in your total.  Any additional charges relating to this will be the sole responsibility of the recipient and will be payable to the applicable local tax authorities prior to delivery.