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Old 04-02-2015, 10:31 PM   #1
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New topic

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..


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Old 04-02-2015, 11:33 PM   #2
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An H pipe with or with out cats?
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Old 04-03-2015, 05:20 AM   #3
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With cats


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Old 04-03-2015, 05:28 AM   #4
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Long tubes or shorties?

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Old 04-03-2015, 07:39 AM   #5
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Lol.....I heard long tubes is the way to go....correct me if I'm wrong! HOW much LOUDER? Lol


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Old 04-03-2015, 12:28 PM   #6
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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.
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Old 04-03-2015, 01:04 PM   #7
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Quote:
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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.
What is it inside you car?
So long as it doesn't approach limits that can do damage to your hearing over time. Here's a guide:

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Old 04-03-2015, 05:03 PM   #8
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As a drummer, that's a scary chart lol


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Old 04-03-2015, 05:33 PM   #9
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What?


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Old 04-04-2015, 03:39 PM   #10
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As far as I know LT's are illegal pretty much in all states. They are much harder to install as well. They also hang lower. I'd stick with shorties.
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Old 04-04-2015, 04:13 PM   #11
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Lt's are illegal ? First I heard of that. Did you get your gears in yet?


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Old 04-04-2015, 04:32 PM   #12
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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.
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Old 04-04-2015, 04:42 PM   #13
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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.
They might not be illegal everywhere but I know that there are more places than Cali that they are illegal. Check where you live.

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Old 04-04-2015, 04:48 PM   #14
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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.
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Old 04-04-2015, 04:59 PM   #15
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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.


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Old 04-04-2015, 05:03 PM   #16
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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.


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Lucky. I lived in Chicago and Im pretty sure in Cook County you have emission testing.
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Old 04-04-2015, 05:05 PM   #17
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Yes we're just south in kankakee county and we've NEVER had emission testing!!


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