Stock Exhaust Pic (Internals)

[Raijin]

Yes, I did it!
It was quite the challenge bet it was 150% worth it, it now has a dark deep sound, but more mellow and softer than the Doma exhaust, I don't get headache after a longer trip like I sometimes used to with Doma. But it's loud enough when I twist the throttle. Combined with the looks of the original exhaust, I think this is a perfect thing for a Vmax.
I don't know what it did with the power, I should dyno the bike now. Because with the stock inner workings the bike has the stock 145 hp. I still have the stock pipes but the muffler is different after that, now it's a 35mm perforated free flowing pipe.

For this to be perfect you need a welder with a very long neck to reach the insides, I only party welded them in place and the rest I did with special exhaust cement. Let's see how long it will last, I can always grind it out and reweld if need be.
Getting the wool with the pipe was kinda difficult. But in hindsight I could have put less of that glass fiber to make it easier to slide it in and it would be just slightly louder. Maybe that's why it is quieter than Doma...
Because the pipe was only about 24cm long I thought it would be a lot louder than the 32cm Doma. Perhaps the chamber before that also dampens some of the sound.

I popped the stock plate back up and no one is the wiser, except for me and you

So now I have the stock pipe work as it should be, connecting the rear two cylinders but with a nice free flowing sound. Very happy with it!

 

[Raijin]

Here is a little video of how it sounds while revving... Use headphones. Still doesn't like real life of course, but you get an idea, couldn't rev it that much with engine being cold, it was about 3500 rpm...

I should make some drive by videos.
I like how it idles though! Very smooth and stable.

It does have a different tone now having the rear cylinders connected as they should be, compared to most slipons which leave the rear cylinders unconnected and the front connected.

I also feel as if it has a little bit more torque at lower revs, midrange too.
Like I said, I should dyno it!

 

[Raijin]

I couldn't leave it like that, so I recently grinded the muffler open before the muffler and welded in some pipes with an H pipe between the rear cylinders.
Welded it all back and even if I say so myself, it doesn't sound half as bad.
It's been quite the job but I think it was well worth it.
Now I have the sound of a slip on muffler with the OEM looks just like I wanted!

Here are some pictures and a video.

I can't wait for some nicer weather to really test it out. I only rode like 300 m down my street where they don't salt the roads
View attachment VID_20220120_173623463.mp4

 

[VMAXer]

Interesting pics, nice sound.

 

[Fire-medic]

A deeper sound, and it appears like it should stay together. There's no provision for re-packing unless you cut it apart?

 

[Raijin]

A deeper sound, and it appears like it should stay together. There's no provision for re-packing unless you cut it apart?

Much deeper in person, but not as annoying-headache-deep like Delkevic or Black Widow where it's just base... It has a nice mellow tone to it, must be because of 34mm muffler hole. Usually slipons have like 50+? It's hard to explain unless you hear and feel it in real life.
I guess you could compare it with those base-heavy Dr Dre Beats headphones vs a good pair of balanced hi-fi speakers.


Repacking shouldn't be necessary, there's stainless steel wool around the perforated pipe with fiberglass. I chose the highest temperature materials because I was aware of my type of construction. I used PowerSprint Construct materials btw.
But if the need will ever be to repack, I just have drill the rivets and take off the black end plate, grind out the welds and the thing should come out pretty easily. Much easier than repacking a slipon I reckon?
The only thing I partly welded was the end plate of the muffler on the inside - but I have a long neck-grinder that I used to clear out the stock inner crap. But that plate doesn't need to come out if I need to repack.

And yes, I am pretty sure it will all stay together - the pipes are welded to the body of the stock muffler, they got nowhere to move, neither can the muffler move because that is also welded to the end of the stock muffler body. And the pipes slide in like half a centimeter into the perforated pipe, sealed with some of that cement.

I deliberately chose a smaller muffler exit, to imitate the back pressure of the stock muffler with all it's baffles with the idea that the claimed 145 hp is with stock OEM muffler.
Plus I didn't want/have to modify the end plate - the idea was to keep the stock look!
Same idea with the pipes. Usually when two pipes join, they should exit in a bigger diameter.
But again, the idea was to increase the back pressure a little, like the stock muffler does. So I kept them all the same diameter, it made construction easier too.
Only the H pipe is smaller - 32 mm. The rest is all 35mm.
I welded it all with stainless steel wire, it bonds quite well to normal steel, of which the original muffler is made of. The pipes itself are stainless.
So at least the welds will never rust not that I ride in the rain lol.
Perhaps some day I will just mask the chrome and paint all of that matte black, like the stock look.

Now all I can do is wait for spring and really test it out.
Perhaps a Dyno test should also be in order.

 

[DreamV4]

This is universal "muffler", which I used many times for old GoldWings.
https://www.autozone.com/emission-c...ickson-universal-exhaust-flex-pipe/558011_0_0

 

[Raijin]

This is universal "muffler", which I used many times for old GoldWings.
https://www.autozone.com/emission-c...ickson-universal-exhaust-flex-pipe/558011_0_0

I have seen it before. But I think it will be quite a challenge to weld it...

 

[DreamV4]

I have seen it before. But I think it will be quite a challenge to weld it...

use radiator hose clamps.
Aftermarket bike mufflers are pretty cheap on ebay, never used them.
Sean can design and sell 3-way connectors, allowing use of aftermarket mufflers. Or connectors+mufflers kit.