werks

Different car but interesting results. I just got a new exhaust sytem from Burns Stainless for my Z06 that is pretty modified and asked the guys at T-hil to test me for sound about 2 weeks ago. My car came in at 97db and that is with the Burns Stainless straight through (mtorocycle style) mufflers on it and I have headers, big cam, high compression etc. etc. I'm not familiar with the stuff for your cars but if you have re-buildable mufflers is it possible that the packing material is just burnt up and you need to re-pack them?

usctrojanGT3

I think what happens is that once you bypass the side mufflers with the SW set-up it's basically like running track pipes with no mufflers. I know my fabspeed maxflo won't pass the 103 TH or 105 LS limits so I'll throw my stock center muffler with BBI side muffler deletes to make it work.

medpilot105

I remember that video! Mikymu is definitely our resident DIY'er and Technical tester for sure.

I don't claim the SW product isn't loud but what gets me is that I've never busted sound in this car with this configuration at any track in California but all of a sudden, now I do. I'm figuring out which option I want to take as I don't want to not support these tracks and my HPDE habit.

85Gold

Side muffler delete and run stock center muffler, headers and cats. I have this setup on my 6GT3 and it is 95/96db as measured at RR a local track that has a 103db limit. I put my stock muffler back on da Civic for my Left Coast trip do I wouldn't have any sound problems.

Peter

medpilot105

Thanks, Peter!

usctrojanGT3

That is EXACTLY what I'll do for the LS 105db weekend and TH's 103db weekend. If I don't pass at either with the stock muffler, I'll never go back to those tracks again!

MarinS4

I have run these before on my car and a friends GT3.

http://www.jegs.com/i/Dynatech/329/7...FRSPfgoda7kAJA

They don't seem to affect power. I can't really tell the difference in sound either but the meter sure does. I dropped 4db with em at Sonoma.

Everyone is tighten up on sound this year. I was shocked when I got flagged at Sonoma. Thill has always had funky sound readings. I suggest you address it with a bolt on tip type solution. Angles and/or cones will get you under the limit.

montoya

They got me in November. Spent half a track day having this fabricated. I'm running the full Akra setup. With bypass pipes I was just barely under the limit.

medpilot105

Yup. Looking into it.

aussie jimmy

maybe higher readings in the wet due to reflective surface where sound waves bounce off road more?

Slowandsteady

Nice updated avatar, medpilot. . . I can't see my big wing behind you.

Slowandsteady

Interesting. I hope that you're right.

aussie jimmy

not sure, but just throwing a thought out there.

usctrojanGT3

Maybe cold, cloudy, and/or rainy days register a higher DB reading.

mooty

meh...
they have a meter
they have a meter guy.
i am not sure that the meter guy knows how to read meter. the concept of number line 103 > 90db is not easy to understand. i think they need help.

i am willing to be the meter guy. i know math.
all our cars are 80db