alot of cam guys are having difficulty with the dynomax unit. this externally adjustable valve could potentially bridge the gap....

 

Yeah, I looked at the dynomax unit and it looks like dog crap, very poorly constructed.

 

I would be very interested in this muffler if it was available for sale. A black stealth looking color option would be great also.

 

I thought you posted that you had it tuned with the S2s? You shouldn't need to retune for the muffler if that's what you're suggesting?

 

Ben, the market for evo 8/9 mufflers is not exactly going to have a growth spurt.
IF you can make money at 400 per unit with only twenty sales... I think thats all you should figure.

Now if you can get the OP to promote the thing, he is good at sales isn't he.

 

Hey, Ben,
how about a flow through muffler with a valved insert that you just thread into the flow through? That way you could get the hard core motor sports guys and the mom and pop thrill seekers.

 

LOL

Well here is the deal. If BenJ is going to make this thing no need to incorporate it into a muffler. Just make a pipe slip over or weld on section with the Valve. Regardless if there is a muffler or not, the noise difference would be very minimal to even need it.

I would love to just have the valve part just so there wouldnt be a muffler sticking down in the back. We would then easily make a home made flat underbody for the rear section without worrying about clearance with the muffler. Also it would be a weight savings for those that care about that.

In other words a full 3" muffler less & catless turbo back system.

 

I will have to gather up some of my drawings for you but in short I designed it so that you can run the valve in either a muffler or straight pipe. It is in essence a billet circular piece with a sprung valve in the center and ports along the outside perimeter. Hard to explain but when I get pics it will make more sense.

 

totally incorrect... such piece usually are universal. i'd think popularity with this group will easily spill over to other turbo cars with 3 inch... assuming design, quality and price is right.

 

No I didn't mean to imply that the muffler would require a new tune. It's a looooong story about a tuner EVERYONE knows but I'm not into bashing. I'm going back to get a retune because I've added a downpipe and the idle fluctuates because the egr hose was off when he tuned it(he took it off to test something). It was an oversight on his part that caused an inconsisstant idle WHICH I hope goes away with the new tune.

Outside of the fluctuation the idle doesn't seem lopey from what I can tell. I'm going to have a local shop look at the VT muffler with me tomorrow. We will test fit it, and if it doesn't rattle, weld a v band onto it so it can be interchanged and weld on the stock exhaust tip.

I promise to post results when I have them.

 

So I finally had the vt muffler installed. I ordered it from maperformance, and it appears to be the upgraded one. I brought it to my local exhaust guy and he cut off the old Magnaflow and put on the dynomax with a flat band clamp (in case I want to swap it out). He painted it matt black too so it wouldn't rust out. Then, I gave him the factory muffler and he cut off the tip and welded it to the new unit.

Let me say that this upgrade is even quieter than I thought it was going to be. I put the clutch in driving and I think it stalls it's so quiet. This really is the answer for those looking to have the ultimately quiet exhaust.

The only downside it does rattle a little when Rpms are below 1k. This really doesn't bother me bc it's isn't as loud as a heat shield rattle.

At first I thought I lost some low end power but now I think I feel that way due to the lack in sound to accompany take off. I'll be going back to the dyno soon anyways. I'll pos my findings.

Again, hats off to the OP for putting the time money effort into this.

 

Glad it worked out for you. This muffler seems to be the ticket for those with mild cams.

 

Dfelton , thanks for posting and the props . With my setup up until now there is zero rattling . So you said there is very slight rattle at below 1k Rpms ? Did you try installing it with flapper up and down and see if it made a difference ? Also with your setup how loud is that slight rattle ? Can you hear it inside the car with windows up or down ? Is it very audible standing behind the car ?

Also one more thing to add . I removed the blox lower frot engine mount and now my car is completely 100 % stock sound level wise . Before it was stock also but the harder mount brought in engine bay sounds a little through the chassis .

 

Dfelton , thanks for posting and the props . With my setup up until now there is zero rattling . So you said there is very slight rattle at below 1k Rpms ? Did you try installing it with flapper up and down and see if it made a difference ? Also with your setup how loud is that slight rattle ? Can you hear it inside the car with windows up or down ? Is it very audible standing behind the car ?

I didn't install it myself because I don't have a welder or the cutting tools to remove the old muffler, so a shop did it. When i picked it up, there was NO rattle. After 25 miles, when I reached home, I noticed it when I was parking.

If I am in the car with the windows up, I won't hear it.
If I am in the car with the windows down, I can faintly hear it.
If I am standing behind the car, it is noticeable, but not louder than a heat shield rattle.

It's odd that it was fine at first, and then started to rattle. I only have a total of about 20 minutes driving with it, but the feeling is a but different. The exhaust note is kind of strange. I can FEEL than valve open and close. This was dynotested already at MAperformance though right? I recall reading it did not lose any power, I guess noise makes it feel faster.

Who knew honda guys had it right all this time!?

 

Thinking about doing dual VT and magnaflow where the cat is