Quote Originally Posted by JIgou View Post
1. I can replace the exhaust from the head back. Materials are "any material". I pick a straight pipe with a small muffler.

Next up, I have to pay attention to a, b and c.

a. Exit behind the driver. No problem.

b. Comply with noise. No problem.

c.......
1. Any high flow cat is allowed.
2. Multiple cats may be replaced by a single cat, and the location of that single cat is specified.
3. If it didn't come with one, I don't have to have one.

Bolding is mine. I don't see anything in there that says I need to keep a cat. I'm ALLOWED to have a high-flow cat - no requirements there. I'm ALLOWED to replace two factory cats with one, and if I do that I'm restricted on its location. Only requirement is location. If the car didn't come with one, I don't need to add one. Again, no requirements.

It may very well be the intent that a cat is required, but I would have NO problem showing up with no cat and pointing at this rule in support of that.
The key piece is #3. It specifies when you can NOT have one.