Slip-on turn down tip recommendations for BW exhaust?

[eternaln]

On my short test drive near our home, the turn down helped significantly.

I'm thinking of adding this to my BW race exhaust. I was measured at 105db and need to lower it to 102db. Am a little skeptical that this turndown would do the trick, but it seems it might be enough.

[MD_M3]

Got around to snapping a picture of my turndown

[Feffman]

How did you attach it? I got one but am unsure of how to mount it.

I notched the large end on two sides so the strap style clamp would squeeze it tight around the end of the exhaust.

Feff

[TrackTracktor]

Maybe this
https://www.amazon.com/gp/aw/d/B07S4...b_b_asin_title

Its slip fit, going to try a large hose clamp but was hoping there was an official solution.

[SQ13]

Maybe this

https://www.amazon.com/gp/aw/d/B07S4LMKZH?psc=1&ref=ppx_pop_mob_b_asin_title

[TrackTracktor]

On my short test drive near our home, the turn down helped significantly.

How did you attach it? I got one but am unsure of how to mount it.

[Feffman]

Is it noticable on the street, wouldn't mind one for driving to the track.

On my short test drive near our home, the turn down helped significantly.

[TrackTracktor]

I did a Dynatech turn down with an internal baffle (link below). Haven sound tested it yet, but will do so at NCM in April.

https://www.summitracing.com/parts/dtc-780-01200

Feff

Is it noticable on the street, wouldn't mind one for driving to the track.

[bigjae46]

Bruh...some lotion! 🤣🤣🤣

Great work...I might copy that. I keep hearing rumors that Cresson actually has a noise limit but they don’t enforce it.

Now...there are houses going up around there (besides the trackside villas). Just a matter of time...


Sent from my iPhone using Tapatalk

[SQ13]

Great thread. I’ll look at doing something similar over the winter for the tracks in the NE that have db limits. SQ13 what is the lowest sound limit you’ve passed at?


Sent from my iPhone using Tapatalk

Sorry for the late response. The only track I’ve driven at that has sound restrictions is Harris Hill:

“A decibel limit of 99db trackside and 85db at the property line will be enforced at all times.”

No idea if they were actually measuring, but they have kicked out people in the past for sound. I was safe, and the owner of the track actually took photos of my Laguna pipe and thanked me for being considerate.

[MD_M3]

So on my muffler I have a 3.5" ID and we made 4 slits on the muffler and use a clamp over it so we can swap tips form a straight pipe or an angled pipe to make sound.

[rnh204]

Great thread. I’ll look at doing something similar over the winter for the tracks in the NE that have db limits. SQ13 what is the lowest sound limit you’ve passed at?


Sent from my iPhone using Tapatalk

[Feffman]

I did a Dynatech turn down with an internal baffle (link below). Haven sound tested it yet, but will do so at NCM in April.

https://www.summitracing.com/parts/dtc-780-01200

Feff

[SQ13]

I ended up going with the setup mentioned above—extended muffler + turn tip. The muffler is attached to the BW exhaust using a V band. The turn tip was cut to remove excess piping, and it is tack welded to the muffler. It’ll be getting a V band setup as well, in case I ever need to use a turn tip but not the muffler. The tip does not have dB killer in it. Still, the exhaust is significantly quieter..similar to my old SS Race muffler with stock mid pipes and CPI headers. I can probably have an instructor in the car and be able to hear him/her clearly. I’d still wear earplugs though.

My concern at this time is the lack of a support bar for the muffler. I’m a little uneasy about having the muffler secured by just the V-band given the muffler’s weight (may be overreacting here). Plan on getting that done hopefully soon. Also, if you cut the turn tip like I did, make sure you smooth out the cut pipe very well. I didn’t have mine smoothed out well enough and cut my leg while washing the car.

[SQ13]

After talking to some people, I think I’m going to use V-bands. I’m going to cut the exhaust tip off and add a V-band flange to the cut ends, as well as the additional muffler. That way, if I need to use the Laguna pipe I’ll just remove the exhaust tip and install the muffler. Muffler-to-elbow will most likely still be held in place using a couple of bolts.