But that stinger exhaust design could be replicated with mufflers that are not as loud? I'm just curious how that setup would compare on a dyno to other 3.2L setups?

The outlet pipe out of the muffler cans looks to be 2 1/4" or possibly 2 1/2"? Just an estimate.

Mike Silva has the latest proven design on his car, I am sure he will post his findings soon. I worked on it a long time. If does balance between the two sides and I believe will make the most power of any muffler to date. William Knight
knightrace@mac.com
615.969.4917

Dsilva. auto correct.........

I think the first install didn't go well based on how the fitters put it in.

William - i know that this is strictly about power, but does it drone? I realize this is not important for a race car.

Yes, apparently I wasn't very clear in my request.. they plumbed the muffler as below:
https://i.imgur.com/jG8ChAm.jpg?1


Surprisingly, the car ran like this.. but now it has been rectified to run the correct way. It is heading back to the dyno in a few days.

Initial impressions.. Very different exhaust sound and hard to describe. Raspy and throbby. Below 3000 rpm, not much happens, but after 3000 rpm, it really opens up, but again, has a throbby sound.. not smooth. I'll try to record an audio clip on the weekend.

I have cruised in it etc, and confirm there is NO drone at all.

That sounds awesome. How high did you rev it?

I cannot see the link as facebook is dead in Australia at the moment, but I think that was Mike Small's car.. not mine.

That would be mine. Dyno operator shut down right around 6500.

I ended up ditching my heavy old B&B muffler and replacing it with the Dynomax 17231 which is the same one that you have there I think. Its so much more of a straight thru design than the B&B that it has to flow better. The B&B was terrible imo. Too heavy, the muffler outlets were not centered with the outlet pipes so it bottlenecked down to about 2.00" there and it also had lots of baffles that looked like they were added on to deal with sound issues.

I'm excited to get the car back together and go test it all out! Been down for a while with a broken transmission.

Everyone, Sorry not trying to hijack the thread, I worked for years to come up with a muffler that had little to no drone and was plenty quiet for the street. I believe I came up with the perfect cost effective solution. I am not selling it. Most of my clients who have the muffler tell me it is quite with almost no drone. Mike DSilva is a client of mine, He has a link where their comparing my muffler with my headers to about a $4500 set of headers and a cup muffler. Maybe he can add the link. I think on the same headers it will match or beat the cup muffler and be more quiet as I think there loud. The plumbing on them is not as you would think. I am hopeful Mike writes in here on this link and tells what he thinks of the muffler, sound feel vs the M&K he removed. My name is William Knight if someone needs headers, the muffler I send people to Summit racing and I appreciate any business and try and help Pelican people. my email is knightrace@mac.com

Yep, William has been brillant to deal with. He helped me choose my cam, pistons and gives me plenty of his time, even though I am half way around the world!

The Dynomax 17231 is to me, not overly loud at all. I don't want to say negative things about the M&K muffler.. It is beautifully constructed and very very light. And Brian is brilliant to deal with.
But the M&K GT3 is loud! real loud! and in my application, the drone was significant. I know other people that are running a stock 3 litre motor with the same muffler and they claim theirs does not drone at all. Like anything, it seems a modified motor is an unknown quantity.

One thing I will say, is that with the M&K, my engine ran very smoothly. Down below 3000rpm, it was very smooth. And whilst it didn't achieve the dyno numbers up top, there was no untoward vibration.
So far, my experience with the dynomax 17231, is that there is a little hesitation around 2200-2400 rpm still.. even though the muffler is straight through, with both exhaust flows travelling in opposite directions to each other. It is going back to the dyno in a few days to be sussed out and hopefully make it smooth.

The dynomax sure makes the car feel like it is a rocket at 3000 rpm though. According to my AEM Infinity logs, the volumetric efficiency is a good 20% higher above 4000 rpm, when compared to the M&K. At 3000 rpm, it feels like a turbo is kicking in! This might be exaggerated by the lack of performance below 3000 rpm though. But driving both mufflers back to back, the kick at 3000 is much greater with the Dynomax compared to the M&K.

Sound - if the M&K was less loud, I would prefer it. It is simply too loud everywhere for me. The Dynomax has a different sound. Volume is much lower of course, but I'm yet to decide if I like the sound yet.

Mike I still don't know what was wrong with the plumbing...maybe you could ELI5 it?

Also I think we need video of how the car is after the last dyno run.

The way to set this muffler up correctly either 123 side or 456 side enters the top of the muffler and exits the top of the other side.. the other side depending on what side you used enters the bottom and exits the top. I spent years making magna flow and they will not make the peak power I get out of this one. The first mock up on this muffler was about 4 years ago. The welding I did was not the prettiest as it was an experiment on how loud would it be? It works like a rifle silencer, there is a connection between the sides inside the muffler. If anyone wants to see photos of the first one please email me at knightrace@mac.com Thanks, William Knight

http://forums.pelicanparts.com/uploa...1552544035.jpg
http://forums.pelicanparts.com/uploa...1552544035.jpg

The specific M&K muffler being tested cannot be compared to the dynomax or William's muffler as they are completely different in design and application. The application for this particular M&K is street/sport for stockish engines. The tailpipe placement is also different.
We have an ST (street) version and a MS (motorsport) version of this muffler. The ST is much more quiet while the MS is less restrictive.
We have also built full race systems which look nothing like these and are quite convoluted to accommodate the proper lengths of tubing at the different stages. Race mufflers like headers need to be tuned to the engine for maximum performance. Sound quality and level typically is not a concern. For street use there will be compromises.

Mike
Sounds great. So no drone, same power as straight race pipes, streetable unless you're absolutely on it? Isn't that what everyone is looking for. Tx.

No drone as it’s technically a single out as opposed to dual out. Same power as when dyno’d with no muffler. It’s still relatively loud. Not as loud as my old M&K, different tone though. A bit deeper. Above 3K, it’s downright nasty. Pretty manageable at idle.

If we're talking about the same dynomax, the 2.5" 17231 just like what Knightrace included a pic of, you're crazy if you don't think that it's too loud. I fitted mine to my Billy boat headers (w/ heat) this week and it would be impossible to drive this car on the interstate for more than a handful of miles. You'd get a head ache or go deaf.
I'm worried that it'll get even louder as it breaks in.
To level set, I'm in a targa and that might make things a little louder for me. It's just too loud though. I'm gonna consider adding resonated outlet pipes or maybe another muffler altogether.