I'll get under the truck sometime with a tape measure, and see if that 5 X 10 case will fit or not. BTW, I don't need any more torque down low.....

 

No,that would require me to put my truck back together an thats not happen.Shoot,I keep stealing parts off it for the maro.Im tellin ya its a sad situation.I can however get a clip of the car it sounds real similar beings the exhaust is setup the same.

 

You had this one of these on your truck, whippled, right? IIRC, it was never "finished", but you did have it running, driving, etc. How did it do, and did you ever get numbers? I worry about this style muffler, especially the "Delta Force" series, on a FI setup.

 

This is the magnaflow 30". I like the way it sounds. Adds to the sleeper effect a bit and keeps it low profile. Muffles the sound of the cam a lot, but its real throaty.

 

I meant tip in throttle out of boost.The trucks never been down the track with current mods.Been in a few freeway roll ons with a few pretty quick cars.Its would be safe to say the truck trapped between 113-115mph at 5000#'s.

 

I don't know if you saw this link in the other thread, but ck it out for reference. There are some videos where you can hear the exhaust and pick up on the drone a little from inside the truck when I'm driving through that rpm range.

Silverado SS pictures by slowfive0 - Photobucket

As far as quiet, I'm concerned you will have a hard time getting it quieted down (without really restricting it), not to mention reducing/eliminating the drone. The bigger you go on the exhaust pipe, the louder it gets even if your muffler choice is the same, etc. My 3" exhaust is louder then other similar systems that I've heard in 2 1/2". I think the diesel trucks tend to get away with it (they aren't quiet anyways but.....) because of the turbo. Obviously, the turbo quiets down the exhaust substantially.

So I guess the obviously answer to fix this is to put a big turbo on it. Glad I could help

On a serious note, you might try some bullets or small resonators in your pipes coming off each bank. Probably be your best bet at this point. Keep us posted.

Side note: I don't know if I've ever seen it discussed but did you guys know that the corsa mufflers use this little channel in muffler to basically tune out the sound/exhaust pulses that cause the drone? I never seen anything on this before, but it made sense and I remember seeing the opening in the circumference of the pipe just past the inlet. I'll see if I can find the link.....

Here it is:

http://www.corsaperf.com/technology.aspx

Sure would be nice to find a big 4" Corsa muffler. Did they use one in a diesel application maybe? Would think it would get rid of your drone.

 

Thanks for the idle vid. Do you have any idea about interior volume(decibels) at highway speeds? Honestly, that's the only thing I'm concerned about at this point. Oh, BTW, did you know that your 4" muffler is only a 3.5" muffler on the inside? According to the magnaflow website, the internals of the 30" long muffler are 3.5"

Maybe that's why your truck is so slow......

 

I'll see if I can record the droan on my way to work tomorrow. I wonder if it will work?

 

Its really quiet at highway speed...mouse quiet at 75. It looked 4" in diameter when I put it in...maybe thats why the girls like it

 

See, 3.5" core.