anyone try this Bursch lightweight Sport muffler

[jmz]

I know it will be loud but how loud? ...under 110 DB? Laguna safe?

[shoooo32]

Interesting design. at high vacuum (off throttle/partial throttle) it's 2 in 1 out, so unlikely to drone. Mash the throttle and it's 2 in 2 out and probably sounds rowdy af.

There's not a lot of baffling so I doubt it would pass at Laguna on a quiet day.

[famoroso]

Very recently discussed here ..

1984 3.2 header/exhaust

[jmz]

Originally Posted by famoroso

Very recently discussed here ..

1984 3.2 header/exhaust

Thank you

[stownsen914]

I saw two questions 1. Will it pass Laguna 2 will it muffle to 110 db.

#2 almost certainly depending on how sound is measured. If it’s 50 ft from trackside then usually 911 racecars with open exhaust come in under 110.

I thought Laguna was pretty restrictive on sound. If it’s anything like Lime Rock which has 88 db on muffled days, I’d say no way a race engine with that muffler would pass 88 db at 50 ft from trackside.

[mb911]

Basically a new version of the Triad design of the late Dave Ellison. Everyone always said they sounded great.

[brasch]

We have been working on analysis of various muffler designs with CFD and find that the cross over X style like these seem to create drone and its probably due to the major pressure points on the overlap. We find similar flows in the X style Mufflers that are used too... streams collide together, so people add a valve to reduce the drone, but it seems like a flaw in an old school approach IMHO. Here are some visuals for anyone interested.

[edesign45]

Originally Posted by shoooo32

Interesting design. at high vacuum (off throttle/partial throttle) it's 2 in 1 out, so unlikely to drone. Mash the throttle and it's 2 in 2 out and probably sounds rowdy af.

There's not a lot of baffling so I doubt it would pass at Laguna on a quiet day.

Correct! The vacuum line must be connected for quiet operation at off throttle/partial throttle. At WOT, the Super Sport is very racey/loud when the valve opens, but that was the intention. Bursch also offers a traditional two-in two-out stainless sport muffler (Rally Sport) that is quieter but still an aggressive sound.