Exhaust – 2.75″ Performance Race Headers w/ HFC Downpipes (JHM-OEM) for B8-RS5 4.2L

Introducing the JHM B8-RS5 4.2L FSI V8 2.75″ Performance Race Header Modification! 

Remove your restrictive and failure-prone OEM Catalyst with our JHM 2.75″ Performance Race Header Modification.  So far, we have yet to see a catalyst that isn’t breaking apart.  This will affect your vehicle’s performance and can even lead to engine damage if the catalyst completely clogs.    With our smooth-flowing transition collectors, your B8-B8.5 RS4 and RS5 4.2L will be able to take full advantage of the high RPM capability and increase power throughout the entire RPM range.  Especially, when paired with our JHM Stage 2 ECU and TCU Tuning Combo and our JHM 2.75″ Performance Exhaust system.  Want even more?  Check out our JHM Lightweight DSG Flywheel for even faster acceleration capabilities.  

!00% BOLT IN – NO CUTTING OR MODIFICATIONS TO YOUR STOCK CATBACK REQUIRED!

COMPATABLE WITH JHM 2.75″ VALVED PERFORMANCE CATBACK!

Why 2.75 Inch piping diameter? After much research, calculations, testing and development we found that based on the 4.2L 32v V8 engine’s demands, 2.75 Inch piping diameter is the optimal size. With a 2.5 inch exhaust you end up choking off the RS5’s free spinning and high-revving V8. We have also found with a 2.75 inch cat back that torque is not sacrificed for power gains in the top end of the RPM band. 

Gasket Matched Flanges:  The stock headers on the B8-RS5 are a LARGER diameter than the stock downpipes.  This creates a flow restriction and hinders performance.  This is because the exhaust gas is forced into smaller diameter piping.  Additionally, this transition from larger to smaller diameter piping is not a smooth transition.  The smaller diameter of the stock downpipes introduces a wall that the exhaust gasses must first run into before being able to transition creating turbulence. With our JHM Gasket Matched Flanges and the larger diameter of our 2.75″ exhaust piping, there is no longer hindrance in exhaust flow allowing optimal exhaust flow for optimal performance gains. 

Features:

• 2.75″ 304 Stainless Steel Construction

• 304 Stainless Steel V-Bands

• Smooth-Flowing Transition Collectors

• Direct Fit Installation

• USA High Flow Catalysts

• HAND MADE IN THE USA

INCLUDES:

• JHM Performance Race Header Modification

• JHM High Flow Cat Downpipes

• Exhaust Manifold Gaskets

• Exhaust Manifold Nuts

• Downpipe Gaskets

Customer Videos:

NOTE: We do our best to provide a turnaround on header cores within 5 days of receiving them.  Due to varying lead times, this can span further than 5 days. 

NOTE: Due to the low availability of header cores, we are currently unable to provide a core exchange.  You will be required to send your headers in for modification our source a spare set of headers to send us for modification.