Originally Posted by 11gt
The only reason I quoted your post is that you seemed to mention that an axle back could interfere with emissions equipment.
For your post, both Borla and Magnaflow mention that they meet the SAE test. While I am sure the police are not required to carry a decibel meter, you can bet that if I lived in CA, I would carry the results of such a test on my vehicle in order to prevent harassment.
No worries. What I wrote and meant was, in a state like California that has noise regulations and its own emissions regulations, you'd have to be pretty dumb to run a loud exhaust because that combination of laws heightens LEOs' awareness for loud exhaust. They equate loud exhaust with modified illegal emissions.
Instead of thinking. "That kid's got a loud exhaust on his good looking Mustang" and debating whether or not to pull you over, they think, "He's got a modified exhaust and probably took out his cats - that could be a righteous bust."
I lived in California for a very long time and talked my way out of more tickets than I can remember and I can assure you that any printed test results would get you nowhere. No cop is going to get his uniform or shoes dirty getting on the ground to look under your car. Besides, he wouldn't be able to identify a specific exhaust anyway to match up with your test results. And, the only test results he would consider looking at would be those from a California State Certified Referee Station or a sign off from a CHP Office. And, even those are dated, so who's to say you haven't put the illegal stuff back on?
He'll write the ticket because, in his opinion, your exhaust is too loud and then YOU get to spend YOUR TIME AND MONEY to get proof acceptable to the court or the California Highway Patrol that your exhaust is quieter than 95 dbA.
Let's not forget a few years ago California cracked down on illegally modded cars and found some ricers with illegal JDM non EPA/CARB engines and actually seized some cars and wound up crushing at least one.
Where I live now, cops don't care one bit about noise. I could run any kind of exhaust I want with no problem - well anything short of a Mazda rotary IMSA race car, but I'm proactive about keeping a low profile when it comes to cops.