Quick-swapping mufflers for Laguna Seca sound

R3ctivision · 06-23-2021, 12:31 PM

Hey all, I haven't run my car at Laguna since I absolutely destroyed the 92 dB limit a year ago (even when short shifting).

I do pass 103 dB sound at Sonoma Raceway and Thunderhill. I'm currently running a AWE Touring catback exhaust and a Rotofab dry intake. I was thinking I might be able to pass 92 dB if I swap the intake to stock, swap the muffler to stock, and put on Laguna tips on the stock muffler. To make the exhaust system easily swappable, I am thinking of keeping the AWE pipes, cutting off the AWE mufflers behind the diff, and using V-clamps to put on either the AWE mufflers+tips or the stock suitcase+custom turned tips as needed based on the event.

Has anyone done this? Will it work? Will it be a PIA with exhaust leaks and fitment issues? I don't even know what the pipe diameters are for stock and AWE Touring. I'd guess stock is smaller, so that may pose a problem for mating the suitcase to AWE pipes.

SFV1LE · 06-23-2021, 01:41 PM

I recall you're the guy who bought Jeff Cooks car, he had a bolt on Laguna pipe solution using the stock exhaust and I believe this worked.

There's a company in the Bay Area that makes a very slick looking slip or clamp-on solution, I'll search for them.

airtroop01 · 06-23-2021, 03:37 PM

Laguna and their sound restrictions kill me. So frustrating.
Or rather people that move next to the racetrack and then complain about the sound to the city of Monterey… makes no sense.

JSH · 06-23-2021, 04:09 PM

Without reading every post, just put the stock catback on it

R3ctivision · 06-23-2021, 04:21 PM

Quote:

Originally Posted by SFV1LE

I recall you're the guy who bought Jeff Cooks car, he had a bolt on Laguna pipe solution using the stock exhaust and I believe this worked.

There's a company in the Bay Area that makes a very slick looking slip or clamp-on solution, I'll search for them.

Yep, I have that stock exhaust and his custom tips in my garage. I'm wondering if anyone has come up with an easy muffler swap solution so I can run the AWE when away from Laguna

appreciate if you have a pointer to that company

Rnovrit · 06-23-2021, 05:11 PM

An alternate set of mufflers with v-band clamps would most likely be the quickest to get on and off. I don't think our cars in stock form will pass Seca sound. I personally like Sonoma over Seca. The new track at Thunder hill is my second favorite though Rovals hit the top of the list.

Try2paz · 06-24-2021, 12:47 PM

Even with the stock mufflers you wont past 92..

You have to look for 95 DB days which are out there and then of course 105.

I pass 95DB days using laguna pipes and these inserts.

https://www.summitracing.com/parts/cci-3di25r

Obviously get the right insert for your size of LS pipe. I've had them tack welded inside the pipes and they cancel out the sound.

They work great and I've had no issues but id give up on the pipe dream of making 92DB days.

rickybobby · 06-25-2021, 08:07 PM

I have stock exhaust and Laguna pipes and can do 92 db days without any issues.
It actually sounds better going down the front straight since the pipes shoot the sound to the left and off of the wall. Haha.
I’ve got a 90db day next week and will report back if I have any issues.

SFV1LE · 06-25-2021, 09:59 PM

Quote:

Originally Posted by R3ctivision

Yep, I have that stock exhaust and his custom tips in my garage. I'm wondering if anyone has come up with an easy muffler swap solution so I can run the AWE when away from Laguna

appreciate if you have a pointer to that company

I couldn’t find the company, frustrated about that they looked like a top notch track prep place.

06-23-2021, 12:31 PM	#1
R3ctivision 1LE Convert Drives: 2018 ZLE Join Date: Apr 2017 Location: Mountain View, CA Posts: 367	Quick-swapping mufflers for Laguna Seca sound Hey all, I haven't run my car at Laguna since I absolutely destroyed the 92 dB limit a year ago (even when short shifting). I do pass 103 dB sound at Sonoma Raceway and Thunderhill. I'm currently running a AWE Touring catback exhaust and a Rotofab dry intake. I was thinking I might be able to pass 92 dB if I swap the intake to stock, swap the muffler to stock, and put on Laguna tips on the stock muffler. To make the exhaust system easily swappable, I am thinking of keeping the AWE pipes, cutting off the AWE mufflers behind the diff, and using V-clamps to put on either the AWE mufflers+tips or the stock suitcase+custom turned tips as needed based on the event. Has anyone done this? Will it work? Will it be a PIA with exhaust leaks and fitment issues? I don't even know what the pipe diameters are for stock and AWE Touring. I'd guess stock is smaller, so that may pose a problem for mating the suitcase to AWE pipes. __________________ 2018 Camaro ZL1 1LE (Red Hot) 2002 BMW Spec E46 race car (Lizard Green) Previous cars: - 2018 Miata RF GT (Machine Gray/Auburn) - 2017 Camaro 1SS 1LE (Summit White) - 2008 BMW 135i (Montego Blue) - 1996 BMW 328i (Arctic Silver)

06-23-2021, 04:09 PM	#4
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,558	Without reading every post, just put the stock catback on it __________________ '20 ZL1 1LE A10, OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.

06-23-2021, 01:41 PM	#2
SFV1LE Drives: 2018 Hyper Blue ZL1 1LE Join Date: Dec 2018 Location: CA Posts: 1,360	I recall you're the guy who bought Jeff Cooks car, he had a bolt on Laguna pipe solution using the stock exhaust and I believe this worked. There's a company in the Bay Area that makes a very slick looking slip or clamp-on solution, I'll search for them.

06-23-2021, 03:37 PM	#3
airtroop01 Drives: 2018 Cadillac CTS-V Join Date: Jul 2012 Location: Livermore Posts: 92	Laguna and their sound restrictions kill me. So frustrating. Or rather people that move next to the racetrack and then complain about the sound to the city of Monterey… makes no sense.

06-23-2021, 05:11 PM	#6
Rnovrit Drives: 2018 NFG ZL1-1LE Join Date: Jun 2018 Location: Near the water Posts: 304	An alternate set of mufflers with v-band clamps would most likely be the quickest to get on and off. I don't think our cars in stock form will pass Seca sound. I personally like Sonoma over Seca. The new track at Thunder hill is my second favorite though Rovals hit the top of the list.

06-24-2021, 12:47 PM	#7
Try2paz Drives: 1967 Nova Join Date: Dec 2017 Location: Livermore Posts: 72	Even with the stock mufflers you wont past 92.. You have to look for 95 DB days which are out there and then of course 105. I pass 95DB days using laguna pipes and these inserts. https://www.summitracing.com/parts/cci-3di25r Obviously get the right insert for your size of LS pipe. I've had them tack welded inside the pipes and they cancel out the sound. They work great and I've had no issues but id give up on the pipe dream of making 92DB days.

06-25-2021, 08:07 PM	#8
rickybobby Drives: BMW M3, ZL1 1LE Join Date: Mar 2019 Location: California Posts: 103	I have stock exhaust and Laguna pipes and can do 92 db days without any issues. It actually sounds better going down the front straight since the pipes shoot the sound to the left and off of the wall. Haha. I’ve got a 90db day next week and will report back if I have any issues.

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