hmmm. here is what i would do since it is obviously driving you crazy... get the car up on 4 jack stands (pretty high) get under car and have someone rev it to see if you can pinpoint it

*****not responsible if you get hurt******
(just sayin)

 

Got under the car and all I can say is it's coming from the test pipes. Can't tell if it's where it meets the headers or where it meets the y pipe. I took the cat brace off to see if it got worse and nothing changed. Tightened everything to make sure the gaskets are fully contacting with the pipes and no change of that rattle noise. Kinda disappointing that no one has a fix for this and no company can garuntee a pipe that is rattle less.

 

wonder if there is some type of mesh in the pipe that broke loose... you could take it down (i know a pain) and shake it around to see if you hear anything

 

You mean in the y pipe? Cuz there's nothing in the test pipes I was walking around yelling through them when I got them...hahaha

 

Do you have any sound clips of your exhaust?

 

dork, but that is funny

 

Hahaha damn that tdx2 is loud. I probably wouldn't even hear the rattling with that on the car. I'm gonna take the y pipe off this weekend and take a look in there with a flashlight see if anything is hanging down

 

it is hella loud.... but gives me eargasms

 

I used to have Berk's test pipe with Greddy Evo2 catback exhaust setup. It was rattle at low rpm because the Greddy was so dame heavy it hang down and hit the subframe under brace. Ever since I have new LTH and full exhaust setup, I have yet hear the rattle noise again. So, I am certain the rattle noise causes by two metal objects is hitting or rubbing against.

 

or vibrating in close proximity... i have something rattling under mine but i dgaf anymore.... you can chase rattles all day and never find them all but i understand your pain

 

This is normal for test pipes. Its the Air hitting your Y Pipe. Turn up the music and enjoy the gains. I've learned to deal with the rasp (not rattle) on decel. You could just push clutch in....

 

Nate350, you have to think about how mufflers and resonators suppress sound levels. Modern units are pretty free flowing, however they create an environment where some sound waves escape the main flow, bounce off chamber walls, and then rejoin the primary wave. This becomes a situation where the two waves are of the same amplitude, but are out of sync and will cancel each other out silencing the roar.

In addition to tuning for this reaction an exhaust system must also deal with the fact that each time an exhaust valve opens a slug of high-speed air rushes through the system. This creates high air pressure in front of the air and low pressure behind it. Maintaining the flow of low pressure through the system is a primary concern of engine tuners as this will help scavenge exhaust from the next cylinder to exhaust and so on.

As you can imagine, tuning an exhaust system to work over all throttle ranges and all RPMs is much like tuning a musical instrument. Your stock system’s tuning accounts for the mass of the cats. By switching them to flimsy little test pipes you are getting some of the pressure pulses banging into each other at certain rpm/throttle positions. This can create the raspy/rattling sounds you are hearing.

 

What I meant was, "I have not yet hear the rattle noise again." The new setup does not have any rattle noise, nor raspy or hissy sound like my old test pipes setup.