V1 Rebuilding the DF exhaust system

[jirwin]

I held the ZZP ultra quiet resonator up to the end of my system and it noticeably quieted it down. Nothing super duper dramatic, but noticeable. Seemed to get rid of some of the deeper tones. I wasn't able to rev it and hold it there to fully test it, but I'm confident it will at least quiet it down from where it is now.

Also did some tests with a spectrum analyzer app on my phone about 5 feet from the exhaust. Its interesting to see the difference:

No ZZP

ZZP

 

[Rttoys]

It did more than I thought it would. I have a db meter at work, I should test with. Autocross will be recording anyways, so that my best comparison.

 

[jirwin]

Idk if you finished yours yet, but the solution sounds great: https://streamable.com/pyhb4c

 

[Dsteinhorst]

Josh, that does sound good!

There's another user here that did something similar, but I'm in the middle of mockup for my new system.

I'm going for quietness, so I have a second stage as well.

 

[Rttoys]

That does sound good jirwin. Nice low tone. Drove to a coffee and cars last weekend. The flow master is a good bit quieter and a better tone.

 

[Rttoys]

Autocross got cancelled last month (stupid 6” of rain), so I’ll have to wait till next weekend for an official db level, but the new exhaust is much quieter. Even if it’s not much quieter in actual db, the tone is lower and more soothing. Plus, it burned in nicely

 

[Rttoys]

Round 2 coming soon…….
View attachment 46800

talon2006 welded up the stainless steel zzp muffler to their flange for me today. Now to paint the pretty welds and see how it sounds.

 

[Desert Sasqwatch]

I'm very curious how much the cone insert will make a difference in the sound level? I'm guessing you will find out at autoX?

 

[Rttoys]

I need to find my db meter so I can test all the combinations. Unless this one is a noticeable difference in tone and volume, I’m going to run the flowmaster one at autocross first. I mostly want the straight one just to be different than others. Gotta be different

 

[Robinjo]

How does the Flowmaster one sound?

 

[Rttoys]

Quieter, but hard to tell how much without real numbers and my stock Df one has been broken apart internally for over a year now, so I have gotten use to the sound. The tone is deeper and driving down the road, it’s much less noticeable than stock. Next autocross I should have real numbers for you. Currently, near full throttle or full throttle, it’s reading 103db as per SCCA measuring. I hope to have a number on the flowmaster at the next autocross in a couple of weeks.

 

[Rttoys]

.

 

[Rttoys]

Looks at them welds

 

[Rttoys]

Does sitting in the Texas sun count as power coating?

and also added the db killer. Will probably install tomorrow

 

[Rttoys]

I really need shorter shift cables. It looks good though. 4# lighter than stock, but 6db louder too.

 

[Traé]

 

[Rttoys]

4# there added to the 30# reduction from the subframe, that’s some good savings.

 

[Joebob]

I really need shorter shift cables. It looks good though. 4# lighter than stock, but 6db louder too.
View attachment 48078View attachment 48079

Shows off that fancy subframe too!

 

[Rttoys]

Ya it does

 

[mike_sno]

I really need shorter shift cables. It looks good though. 4# lighter than stock, but 6db louder too.
View attachment 48078View attachment 48079

How loud is that set up in compare to the original one?