Now that I got you all confused on the gears...how much louder would headers and a H pipe be over the stock manifolds? I've got a pretty quiet set of mbrp's..
From what I noticed, I was not much louder outside going from stock to catless long tubes. That said, it is noticeably louder on the inside. I am currently at 82 decibels (A scale) at 50 feet at full throttle 100 rpm off the limiter. I have the factory cat-back.
Long tubes are legal in most places that are not California. Running without a catalytic converter however, is a federal offense. Most states don't really care what you do to your car as long as police officers can see through your windows, and there are no safety issues. As long as you pass emissions, most states wont care how your exhaust is routed (except for the disaster that is California).
Also, as to how loud my car is on the inside, casual driving had me at 68-72 db, and three full throttle runs through first and second had max at 85.3 db (I have way more road noise than most will due to all the delrin, poly, and Heim joints in my suspension, the 285mm Bridgestone RE-11s on all four corners will also add not insubstantial amount of growl). This was conducted with a recently calibrated decibel meter set to record on the A scale (as required by the Sports Car Club of America for noise testing) with the windows up, blower motor off, and meter mounted 12" above the center cup holders. If necessary, I can go back and cut the motor at speed to determine how much tire and suspension noise contributes.
Just did a quick search. While LTs might pass a sniffer test, it seems they are illegal in a lot of states to be used on the street. If they have a CARB number they can be used on the street. It seems JBA is one of the only manufacturers to have one. Just make sure you know all the laws before doing LTs.
We have no emissions testing where I live in illinois....so LT's it would be....if I decide to further mod my car. It's already pretty quick without the extra noise.
Yes we're just south in kankakee county and we've NEVER had emission testing!!
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