So I want to put in a 4" dump & cat before I go for a tune. Already have a twin 2.5" cat-back pacemaker exhaust which I love the sound of.
Am I right in saying the standard system is 2.5"??? so obviously where the pacemaker merges and bolts up would be a restriction and need to be cut out.
So how then do I split from a 4" to twin 2.5"? Are there pre-fabbed adapters? or will it be a costly custom job?
Throw some dump/cat combos at me.