STX Setup - Exhaust Sound Limit - JDL EL Header

[jflogerzi]

Originally Posted by steverife

I hope you don't really mean 104 db.

I've got the JDL 4-2-1 EL, the JDL Ultra Quiet FP/OP, and the Invidia Q300 and I blow low 80's. I'm guessing the same JDL setup with a Nameless track pipe was easily over 100. It was significantly louder than an STS Honda setup that was in the 98 db neighborhood.

That is quieter than stock

Sent from my GM1915 using Tapatalk

[Tanstin]

Originally Posted by steverife

I hope you don't really mean 104 db.

I've got the JDL 4-2-1 EL, the JDL Ultra Quiet FP/OP, and the Invidia Q300 and I blow low 80's. I'm guessing the same JDL setup with a Nameless track pipe was easily over 100. It was significantly louder than an STS Honda setup that was in the 98 db neighborhood.

Low 80s? even with catless headers? I kinda find that hard to believe. Are you measuring at tailpipe or in-cabin?

Sent from my SM-G950U using Tapatalk

[steverife]

Originally Posted by Tanstin

Low 80s? even with catless headers? I kinda find that hard to believe. Are you measuring at tailpipe or in-cabin?

Sent from my SM-G950U using Tapatalk

Measured at SCCA autocross events - meter set up 50 feet from the edge of the course at a spot where you should pass full throttle.

[M0nk3y]

Originally Posted by RT-BRZ

Just to be clear, I'm not really looking for quiet. I just need it to be inside the 104db limit. As a Solo chair it's bad form for me not to be able to pass sound.

Would the Invidia Q300 achieve this? The Perrin looks nice but it's pushing the budget too much. I'm not building a show car.

Ah, you're one of those people

Anyways, JDL Ultra Quiet Resonated + Perrin 2.5" Resonated does the trick on a JDL 4-2-1 header. This is the outside sound of it:

(Go to 1:35 approx)

[PLX92]

I was in a similar situation last season, I had been using a Tanabe Concept G single exit catback with stock header/OP/mid pipe.

I added an Ace350 catless header and catted mid pipe to the mix and it was horrendously loud.

Ended up replacing the Tanabe exhaust with a CSG Touring86 catback and its MUCH quieter, almost stock levels anywhere below 3K rpm and a nice tone on the upper end. Would recommended 100%

[RT-BRZ]

Thanks to everyone for your input and suggestions. While I may not have gone with exactly what you recommended all of your responses really helped me make a good choice.

I ended going with the MXP Comp RS. I received it today and just got it installed. It was exactly what I was looking for. It's just the right amount of loud combined with a good deeper sound. The 3" pipe is what makes the difference I think.

Thanks again everyone.

[ka-t_240]

Anyone know the weights on the exhaust they are running? I am probably going to need to replace my current one sooner than later, but would like to get something lighter.

Currently, I have the Invidia q300 cat back.

[Breezio]

I love my HKS Hi-Power Spec-L.
It is one of the lightest cat backs you can reasonably buy that is stainless and dual exit @ about 22 lbs.

Here is a thread with most of the exhaust weight information.

https://www.ft86club.com/forums/showthread.php?t=42555

[Icecreamtruk]

@Breadman and anyone here who uses a phone app to measure decibels. Most phone's microphones max out their reading at around 88-90decibels. Some apps do small tweaks to try and get readings beyond that, but its nowhere near accurate. I have an actual sound level meter tool, the same people at tracks/events and cops use (or similar) and when the phone app would read 88deb, I could be reading 100+ on that, or I could be reading 88 as well. Im not saying dont use them at all, just dont trust the reading on it if its 88 or higher, its not accurate enough to avoid getting kicked/warned at a track. I've seen many people already that went thru exactly that, though I would spare you the troubles.

[Breadman]

Originally Posted by Icecreamtruk

@Breadman and anyone here who uses a phone app to measure decibels. Most phone's microphones max out their reading at around 88-90decibels. Some apps do small tweaks to try and get readings beyond that, but its nowhere near accurate. I have an actual sound level meter tool, the same people at tracks/events and cops use (or similar) and when the phone app would read 88deb, I could be reading 100+ on that, or I could be reading 88 as well. Im not saying dont use them at all, just dont trust the reading on it if its 88 or higher, its not accurate enough to avoid getting kicked/warned at a track. I've seen many people already that went thru exactly that, though I would spare you the troubles.

i have one too which i keep in teh glove box in the off chance i get pulled over, but left it on by mistake and killed the 9v. it read within 1db of my phone at idle. that is within the meters range of error of +/- 1.5dB. also if phones are maxed out at 90db just double your distance and now its maxed at at what would be 93db from the starting location. its simple physics

[Icecreamtruk]

Originally Posted by Breadman

i have one too which i keep in teh glove box in the off chance i get pulled over, but left it on by mistake and killed the 9v. it read within 1db of my phone at idle. that is within the meters range of error of +/- 1.5dB. also if phones are maxed out at 90db just double your distance and now its maxed at at what would be 93db from the starting location. its simple physics

As long as you are aware of how it works. Like I said, im not saying dont use them, just know when/if they are maxing out or you actually have an accurate reading. Still, 88db at iddle is fking loud lol. My car used to make 89db at full throttle and load at 15feet pass by.

[Breadman]

Originally Posted by Icecreamtruk

As long as you are aware of how it works. Like I said, im not saying dont use them, just know when/if they are maxing out or you actually have an accurate reading. Still, 88db at iddle is fking loud lol. My car used to make 89db at full throttle and load at 15feet pass by.

again distance matters im about 3-5 feet away. lets say 4 just for the sake of argument, the difference between 4 feet and 16 feet would be 88db and 82db. also iirc that was cold start and at warm idle i was at 82db

[ka-t_240]

Originally Posted by Breezio

I love my HKS Hi-Power Spec-L.
It is one of the lightest cat backs you can reasonably buy that is stainless and dual exit @ about 22 lbs.

Here is a thread with most of the exhaust weight information.

https://www.ft86club.com/forums/showthread.php?t=42555

Have any pics? Everywhere I look at these has different tips and no real info on what tips they have.

Seen blue'd, nomral, and some "cf" covers

[Breezio]

Originally Posted by ka-t_240

Have any pics? Everywhere I look at these has different tips and no real info on what tips they have.

Seen blue'd, nomral, and some "cf" covers

Those are the three styles you can choose from. I have the version with the carbon fiber 'covers'.