![GPF-back Exhaust [Mk4 Focus ST-Line] Intercooler high-flow duct](https://cdn.shopify.com/s/files/1/0367/2621/products/2743-cbe-aa_efd22f6c-646f-4994-82c4-81ae08a3f8ed.png?v=1677682201)
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high-flow duct
Note: Product is compatible with Mk7
Available in yellow/black
Note: The product image is for illustration only
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GPF-back Exhaust [Mk4 Focus ST-Line] Intercooler high-flow ductThe mountune GPF back exhaust for the Mk4 Focus ST Line adds a noteworthy boost to audible performance, reduces back pressure and enhances vehicle aesthetics. Constructed from 304 stainless steel, the 3" bore system improves vehicle performance particularly once power output has been raised, thanks to the low back pressure design, whilst the carefully engineered internal muffler ensures this system remains free from intrusive cabin boom, whilst