![GPF-back Exhaust - EC Approved [Mk4 Focus ST]](http://www.mountunestore.com/cdn/shop/files/MK4_FOCUS_ST_CATBACK_2048x.png?v=1757515065)
![GPF-back Exhaust - EC Approved [Mk4 Focus ST]](http://www.mountunestore.com/cdn/shop/files/MK4_FOCUS_ST_CATBACK_02_2048x.png?v=1757515065)
2743-CBE-AA
The new mountune EC Approved GPF-back exhaust for the Mk4 Focus ST unlocks a more purposeful soundtrack from the 2.3-litre EcoBoost, while reducing back-pressure and enhancing the overall aesthetic of the vehicle.
Constructed from 76mm (3”) 304 stainless steel, the mountune GPF-back system improves vehicle performance, particularly when power output has been increased, thanks to its low back-pressure design. The carefully engineered muffler ensures the system remains free from intrusive cabin boom, delivering a sporty yet refined exhaust note.
The exhaust is fully EC approved, meaning it meets strict European standards for road use, offering performance and sound without compromising compliance.
Please note: the EC Approved system will only currently fit with a stock GPF
The wagon version of this system will follow shortly.
United KingdomGood quality product, nice sounding exhaust, not stupidly loud, fits really well easy to install.
![mountune GPF-back Exhaust [Mk4 Focus ST] Review](https://cdn.stamped.io/tr:h-800:/uploads/photos/535_6115835969730_7bd1e9cb_235c_4238_9532_282ebf9194b9.png?)
![mountune GPF-back Exhaust [Mk4 Focus ST] Review](https://cdn.stamped.io/tr:h-800:/uploads/photos/535_6115835969730_e4e97fe6_fc09_48df_a949_c500798c7418.png?)
![mountune GPF-back Exhaust [Mk4 Focus ST] Review](https://cdn.stamped.io/tr:h-800:/uploads/photos/535_6115835969730_a3487622_cf88_4891_8283_5473abc7c779.png?)
United KingdomReally pleased with the quality and sound of this exhaust. The tone is greatly improved without a big increase in volume which is exactly what I was looking for. The sections have good adjustment which allows for perfect alignment and clearance. I ordered both sets of tips (carbon and stainless steel) and the quality and look is fantastic. Overall really pleased and exactly what I expected from Mountune.
![mountune GPF-back Exhaust [Mk4 Focus ST] Review](https://cdn.stamped.io/tr:h-800:/uploads/photos/535_6115835969730_0fd494ce_6daa_4c98_aeef_bffdd0958326.jpg?)
![mountune GPF-back Exhaust [Mk4 Focus ST] Review](https://cdn.stamped.io/tr:h-800:/uploads/photos/535_6115835969730_e0bea911_5f08_4a23_b81a_b3e202e8c4bc.jpg?)
United KingdomMy experience at Mountune's workshop was excellent. Really good customers service from Ryan and his team . The exhaust is really nice quality looks much better and sounds nicer but not over the top , very pleased and would highly recommended Mountune's products and fitting service . Gary
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Lee Mcdonald](https://cdn.stamped.io/uploads/photos/535_6115835969730_7bd1e9cb_235c_4238_9532_282ebf9194b9.png?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Lee Mcdonald](https://cdn.stamped.io/uploads/photos/535_6115835969730_e4e97fe6_fc09_48df_a949_c500798c7418.png?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Lee Mcdonald](https://cdn.stamped.io/uploads/photos/535_6115835969730_a3487622_cf88_4891_8283_5473abc7c779.png?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From ROGER MAYO](https://cdn.stamped.io/uploads/photos/535_6115835969730_0fd494ce_6daa_4c98_aeef_bffdd0958326.jpg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From ROGER MAYO](https://cdn.stamped.io/uploads/photos/535_6115835969730_e0bea911_5f08_4a23_b81a_b3e202e8c4bc.jpg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Ross Houston](https://cdn.stamped.io/uploads/photos/535_6115835969730_0150ad97_faca_4625_be0a_30100a4ff8cb.jpeg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Graham George](https://cdn.stamped.io/uploads/photos/535_6115835969730_9d364f5f_a985_449d_96e4_395a628f1fb4.jpg?v=1661843568)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Graham George](https://cdn.stamped.io/uploads/photos/535_6115835969730_8da93718_ef5d_4eb9_9119_3a0b3884c4b3.jpg?v=1661843568)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Andy Peng](https://cdn.stamped.io/uploads/photos/535_6115835969730_26ce81e0_a2dc_4b37_ab3e_5c91413300f8.jpeg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Andy Peng](https://cdn.stamped.io/uploads/photos/535_6115835969730_4afc31bf_bd4d_4e8e_842c_72ebbeeb5db8.jpeg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Andy Peng](https://cdn.stamped.io/uploads/photos/535_6115835969730_57f1b14b_c2bc_487f_92e0_7945deea5e5d.jpeg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Andy Peng](https://cdn.stamped.io/uploads/photos/535_6115835969730_020bae21_cfc5_4bee_96db_17d2cd94a299.jpeg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Andre Larsen](https://cdn.stamped.io/uploads/photos/535_6115835969730_08816520_d062_4d40_9e41_ec8e67891f02.jpg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Andre Larsen](https://cdn.stamped.io/uploads/photos/535_6115835969730_23a1c3c2_69df_46e2_bb1e_4b3915dff05a.jpg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Richard Gregory](https://cdn.stamped.io/uploads/photos/535_6115835969730_ce3c3429_07c8_4571_b204_9df2785ad178.jpg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Jamie](https://cdn.stamped.io/uploads/photos/535_6115835969730_69633d7b_ffae_4f26_8b14_16ca48718d3e.jpg?v=)
![GPF-back Exhaust [Mk4 Focus ST] - Customer Photo From Jamie](https://cdn.stamped.io/uploads/photos/535_6115835969730_d352d33c_cfc8_4fbd_8ecf_7c6dd77765e3.jpg?v=)