JCR-Porsche

The JCR Centre Bypass and our JCR Silenced Tips will be 97dB (we have tested this)

The JCR Valved Race Pipe and JCR Silenced Tips will be 103dB (we have tested this also)

Worth noting (thanks John @ Soul) that the figures quoted above are from our own testing performed at Silverstone GP circuit using FIA calibrated equipment. dB ratings can vary track to track and day to day depending on weather, wind etc etc. As far as we're concerned the figures we're quoting are correct but thats not to say that they will 100% correlate with other measurements taken at other circuits.. Even though technically they should.

JC

DR08

Thanks for the info, JC. Will be reaching out to place an order for the silenced tips.

SanDiegoDavid

bumping this thread. Question to the Laguna Seca regulars: Will a 991.1 GT3 RS with GMG center delete pass sound on a 105 day at Laguna?

RDCR

FWIW I was fine with a JCR CMB with my track nanny off.

SanDiegoDavid

I wonder how the sound levels compare GMG vs. JCR?

RDCR

I'd bet the GMG is louder as I have the JCR CMB with the silencers in the valved portion of bypass. Those tone it down a little even with the valves open.

ugotgrossed

What about fabspeed bypass? Are they loyd compare to gmg or sharkwerks?

LAGt3

I have a 997.1 Gt3 with side deletes and stock center muffler. I recently went to LS on a 90db day. I used 1/4 to 1/2 throttle in 3rd gear between turns 5 & 6, near the sound station. It was hard to tell when to get back on the gas, so my lap times were not good. But I was not flagged until mid-day when I experimented with upshifting to 4th. I got flagged for 92.7.

I am planning to go to a 105db day with the same car and same setup. Will 105db be easy to stay under?

I am from LA and Laguna Seca was a bucket list item. I am going back because I want to experience the track the way it should be driven.

Twinturbofan

I am in Orange County so Laguna Seca is a 7 hour haul for me I was at there June 13, 14 for 105 DB days. I have a 996 race car with headers straight into Burns Stainless race mufflers. I put left pointing extensions on and still could not use 3rd gear full throttle up the hill between 5 and 6. Had to lift and watch 2 cars on average go by me every lap. Measured at 106.4 and 107.2. Both near the end of a session when I threw caution to the wind just to see. In my mind, no more LS for me. I will stick to tracks closer to home. But for those that have LS as a bucket list item, you have to have a picture of yourself in the corkscrew!

Jcolombotos

2019 gt3 RS
Dundon headers, side muffler delete , gps switch, soul resonator turn away tips no problem making sound 90-92 db
only issue exhaust shut off valves not as rugged as stock exhaust baffle .
jim

LAGt3

Update to a Laguna Seca 105db day that I went to in June. I did not need to back off the throttle at all and I was never flagged. Also, there were plenty of much louder track-only cars and I did not see any of them get flagged.

sirtom

2018 GT3 Touring - Dundon headers, Dundon loud exhaust (with side deletes), Dundon plenum and bigger throttle body.

I was fine at Laguna 105 dB last weekend - should I be fine at 103 dB this weekend?

CAlexio

Cloud cover makes a big difference... you can blow sound in morning fog and then be fine under sunny skies

JCR-Porsche

Im sure Dundon will have that data if you ask them for drive by noise meter readings for your specific set up

JC

lisocayman

991.2 GT3, stock exhaust, gps, exhaust turns... full throttle, no short shift, passes on 90 days. Just saying 🤷🏻‍♂️