Quote:
Originally Posted by Olgeezer1
The secondary cat delete gives a small but appreciated slightly deeper sound. My exhaust is otherwise stock, except for the golf T mod. keeping both pipes open. One benefit of the secondary cat delete is the removal of a pretty major restriction in your system. Looking at my cats once removed makes me wonder how anything gets through there. There's a slight H.P. gain and others report slightly better mpg. Any competent exhaust shop can cut them out and weld in some straight stainless pipe. There's no downside.
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Just be warned, not every shop will do this job. Secondary or not, the cats are an important part of the clean air act. In many states it's also illegal to remove them and the shop and car owner can be fined.
I want mine removed, but don't want the trouble of re-fitting them every two years when I go for inspection/ emissions.