SIC LSX

iTrader: (10)

I am wanting to make the car a Quieter inside the car! What should i do! I havent been around a car to see the difference with dynomat or stuff like dynomat! What are your thoughts? Thanx

'00_Z

iTrader: (3)

What exhaust are you running? Dynamat would work but its also a heavy material depending on which type you use.

lsx24

iTrader: (45)

Yea we need to know the specifics of your exhaust...

SIC LSX

iTrader: (10)

pacesetter LT, 3"-tsp ory,magnamouth catback! The inside sound was fine untill i put the new tips on! i dont no why but b4 the tips at 70mph you could talk without having to speak up! now you have to damm near yell lol! Went from SLP single tips to dual tips! I guess the Y b4 the tips is making the sound waves go be to the car!

SIC LSX

iTrader: (10)

See what i loved about my setup b4 the tip swap was when i was cruising it was somewhat quiet! But at WOT it was like open headers loud! but with a cleaner sound! Well now the droan inside the car sucks with going to the hwy from 70-85mph! lol my last road tip i dove 90mph most of the way because it was quieter at that speed!
new tips

old tips with sound clip

SIC LSX

iTrader: (10)

Yeah i got to get another band clamp the 3" one i got didnt fit

lsx24

iTrader: (45)

It's because of your Magnamouth catback, that's why it's so loud. You can get a real catback, like Magnaflow full catback and it will quiet it down a whole lot. Another bullet before each tip would quiet it down a little, but not too much because they are not that big. That might be enough to get rid of the drone you are seeing though.

SIC LSX

iTrader: (10)

it was fine b4 i added the new tips I love the sound of it! I need to know how much dynomat will help if it will tone it down a little im fine.

SiL3NtXWS6

iTrader: (17)

dynamat is heavy stuff man.. and it starts getting expensive. I would think just adding a muffler would settle things down.

SIC LSX

iTrader: (10)

i would only do the back seats back! 20lbs or so

koolaid_kid

iTrader: (21)

A little physics here to explain why the tips made it louder:
Your exhaust (which is also creating noise) comes out in waves. Think of it like waves in the ocean. There are usually 3 waves that are considered the most important. The first wave is the highest, followed by the second, which is somewhat lower. The third is lower still. In physics, these are called harmonics.
What is happening is that the extension of your pipe (which are your tips) are causing one of the harmonics, or waves, to reverse itself and go back into the exhaust system at a different speed. This is what is causing the increase in noise inside the car. Usually, it is the third harmonic that is the culprit. As you described, this effect will be most noticeable at certain speeds, which is also certain exhaust speeds, if you will. You can tune this by adjusting the overall length of your exhaust. If you can move the tips forward or backwards on the pipe, this will change the length of the exhaust, which will move the speed at which the most noise will occur.
Hope this helps.

SIC LSX

iTrader: (10)

Well same thing i was thinking but in different words lol See with old tips there was nothing for the sound waves to hit! Just straight out the tip. Now the sound waves hit the y-then go out the tips. So it makes it louder in the car

Ericbigmac83

iTrader: (19)

dont go dynamat, its heavy and it probably wont end up solving your problem, might just muffle it slightly, very slightly

koolaid_kid

iTrader: (21)

Well, they were still there. But you changed the sound characteristics of the exhaust system, which in your case made it loud at your chosen cruising speed. You can still tune it to change the speed at which it occurs.

TheBlurLS1

iTrader: (8)

Put a 12" spiral flow right in front of each tip. It will refine the tone a bit too and not cost you any power.