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We've never tested the headers with the Dinan SW so I cant tell you exactly how it will perform. The header package will include EVERYTHING you need to bolt on to your engine. You wont need to weld bungs or make your own o2 connections. The headers will install like stock so any aftermarket section 1s that bolt on to your stock headers will work fine.
The primary and secondary cats are really different so comparing the two for performance is kinda tough. We have not seen any significant gains by removing the secondary cats though. We will be posting dyno sheets soon.
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