I know,peepsalot said:because it is only 1/4 of the entire exhaust
you can add a 3 inch cat back and a little piping and still come out lower then some of the current ones on the market.
*edit*
I don't know if u noticed but the price of R&D for the exhaust lays within the first 1/4 of the exhaust.
You can get 3'inch cat back exhausts for like $500.
But as soon as the system is a turbo-back its over $1100.
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