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The M4 development has been based around a valved turbo back exhaust with the addition of a primary de-cat (catalyst bypass) exhaust upgrade
Static Sound Example - Primary Cat Back Performance Exhaust
The unbelievable sound quality is pitch perfect for this engine and when under full load the exhaust system really comes to life with an aggressive tone
Performance Gain: +3
These cat back systems can be matched with a choice of replacement front pipes in the form of either a sports cat or a large bore de-cat pipe to create the most dynamic sound track and performance increases
Vauxhall Astra H VXR (05-11) Secondary Sports Cat / De-Cat Performance Exhaust Front Pipe:Sports Catalyst The M4 development has beenCobra Sport performance exhausts enhance the sound, looks and quality of your vehicle giving you the ultimate driving experience. Our sports exhausts range is fully guaranteed to give you assurance of our quality. This Astra VXR performance exhaust is made in 2. 5" (63. 5mm) bore pipework and fits from the first section to the centre section. The de cat exhaust version is sold for motorsport and off road use only worldwide. The sports catalyst version
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