Ford Focus RS (MK3) Venom Box Delete Race Turbo Back Performance Exhaust

Turn your MK3 Focus RS 2.3 EcoBoost into a track animal. This rear silencer delete, straight-through race system runs 76.2 mm 3.0 inch T304 stainless pipework from the turbo outlet to the tailpipes, removing major restrictions for maximum flow and an unapologetically aggressive soundtrack. Built by Cobra Sport, this Venom back box delete setup is engineered for hardcore enthusiasts who want a no-compromise, motorsport-style exhaust note with rapid response and serious attitude.

Important: this configuration does not include a rear box and is extremely loud. For competition and off-road use only. It will exceed legal noise limits for public highway use.

Why enthusiasts choose this upgrade

• 3 inch 76 mm mandrel-bent T304 stainless steel for optimum gas velocity and durability
• Full turbo-outlet to tailpipe replacement replacing the OEM downpipe, factory catalyst, centre section and rear assembly
• Back box delete straight-through design for an ultra-aggressive tone, crackles and pops under load
• Choice of valve integration:
  • Valved option retains OE valve control so drive modes still influence sound
  • Non-valved option removes OE valves for a fixed, full-volume experience
• Dual 4.5 inch 114.5 mm polished slash-cut tips that fill the RS diffuser perfectly
• Supplied with all required fittings and gaskets except the turbo gasket

Sound and performance character

Expect a much deeper, harder-edged tone than stock that becomes fierce under throttle. In Cobra Sport testing, non-resonated turbo-back setups reached around 100 dB at 4,000 rpm, delivering that sought-after Focus RS crackle on overrun. Venom systems are designed to shed weight compared to the OE system, helping response while amplifying drama.

Sports cat and de-cat choices

• De-cat front section for maximum flow and race-only use
• High-flow sports catalyst option for reduced back pressure compared to OEM

Compliance note: the sports catalyst replaces a factory emissions device and is not EC homologated. It may not meet emissions standards for road use in your region. De-cat options are for off-road use only.

Real-world feedback

We run this system on customer cars and the response has been fantastic. Owners love the sharper throttle feel, the visceral soundtrack and the quality of the finish. It looks right, fits right and sounds outrageous.

Fitting and support

Want it installed professionally? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Good to know

• Some images may show alternative configurations within the range
• Non-valved versions do not affect engine operation but you will not have switchable exhaust volume via drive modes
• Valved versions keep OE valve functionality so sound changes with mode selection

Watch and listen

Hear how wild the MK3 RS sounds with different configurations:

Common searches

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Note: for motorsport and off-highway use where local laws permit. Always check regulations before installation.