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^agreed.
By just putting in a header its like taking a mcdonalds shake straw and taping a coffee stir to the end...its gonna be restriced pdq.
As for the cat, its not going to flow a whole lot better than the stock one when the stock exhaust is still on...2 coffee stirs and a mcdonalds straw in the middle...it just doesnt help...
Scenarios: (- is stock piping and = is new high flow part)
Header: =------
Cat: -----=-----
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