I have an automatic 2003 VY commodore V6 S packand have recently purchased a cold air intake system from you guys and fitted that. I've also recently fitted a 2.5" cat back lukey exhaust (with no rear resonator), a set of pacemaker extractors (yet to be f
Posted by MACE Support on 30 April 2018 09:20 AM
It is best to match the entire exhaust system so it’s the same size diameter, so 2.5" following into 2.5". However, given your current modifications, I would hold off on putting the extractors to be honest. It’s not necessary, but seeing as your stock Cat is now 10 years old and your fitting the extractors it’s a good time to upgrade the Cat. We suggest upgrading to a 2.5’’ inlet, 2.5’’outletand a 3 inch body Stainless Steel Metal Core. We recommend Sure flow Exhaust’s as they provide good customer service and good pricing, they also stock high quality high flow catproducts. Sureflow Exhaust Link:

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