Laguna Seca Sound Barrier Requirement Concern

2004YZFR1 · 05-17-2012, 07:38 PM

Just short shift past the sound shack and pin it everywhere else.

Shamu · 05-17-2012, 10:38 PM

Yeah you should be fine. As you head towards t6 lift as you go by sound shack if you have issues. My Nismo with berk cats and Nismo exhaust had no issue at all. Way below 90 db. If you can fashion a couple of bent stove pipes on tips and face them away from sound shack that might help if you on the edge. Tone of Z however seems to work better than other cars.

scruffydog · 05-18-2012, 11:10 AM

thanks a lot guys...my friend tracks with his 350Z that has straight pipe & Greddy Exhaust and has no problem. I don't know how that compares to the Stillen. I thought Stillen was one of the quieter ones already. But of course I think the Nismo one is a little quieter as it's still OEM factory stuff.
My friend also suggests to build a 90° elbow pipe which can point away from the sound station. HAHA, i might look into that.

I thought the stock one runs around 84 dB.

I contacted Stillen and they replied that it conforms with CA sound laws & any exhaust will be louder than 90 dB with a High Flow Cats.

ryan0 · 05-20-2012, 01:49 AM

Quote:

Originally Posted by scruffydog

My friend also suggests to build a 90° elbow pipe which can point away from the sound station.

away and UP.

05-17-2012, 07:38 PM	#1 (permalink)
2004YZFR1 Enthusiast Member Join Date: Apr 2010 Location: Las Vegas Nevada Posts: 308 Drives: 09 370Z yellow,auto Rep Power: 17	Just short shift past the sound shack and pin it everywhere else. osbornsm likes this. __________________ K & N Filters \| HPS silicone air intakes\| Fast Intentions CBE with 18" resonators \|

05-17-2012, 10:38 PM	#2 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 21	Yeah you should be fine. As you head towards t6 lift as you go by sound shack if you have issues. My Nismo with berk cats and Nismo exhaust had no issue at all. Way below 90 db. If you can fashion a couple of bent stove pipes on tips and face them away from sound shack that might help if you on the edge. Tone of Z however seems to work better than other cars. __________________ Grant

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05-18-2012, 11:10 AM	#3 (permalink)
scruffydog A True Z Fanatic Join Date: Jan 2009 Location: Nor Cal Posts: 1,113 Drives: with his eyes close Rep Power: 719	thanks a lot guys...my friend tracks with his 350Z that has straight pipe & Greddy Exhaust and has no problem. I don't know how that compares to the Stillen. I thought Stillen was one of the quieter ones already. But of course I think the Nismo one is a little quieter as it's still OEM factory stuff. My friend also suggests to build a 90° elbow pipe which can point away from the sound station. HAHA, i might look into that. I thought the stock one runs around 84 dB. I contacted Stillen and they replied that it conforms with CA sound laws & any exhaust will be louder than 90 dB with a High Flow Cats.