I will start by admitting this was a bonehead move on my part.
I saw a really good price on a set of V and H Propipe HO on Ebay. Without doing the proper research I bought them. I had just done the EV 27 upgrade and was looking for new pipes. As I began reading up them after receiving them I came across many comments about highly modified motors. I do not have a highly modified motor.
Basic stage 2 upgrades. No head work.
I have them on the bike and while I see substantial difference at the top end with little at the low end, which of course is where I spend most of my time.
I contacted VH and this is their reply;
"This exhaust system was designed for a built motor. This exhaust will hurt the bottom end of the bike. Top end will be perfect but it will take awhile to get up there. I unfortunately do not offer an optional baffle to help build your back pressure. I would have recommend the standerd Pro Pipe chrome or black. This set up would be perfect for you engine displacement."

I can take John at Mias suggestion and bite the bullet and get the right system, which I am one weekend away from doing, or throw it out to you all and see what you think.
Anyone ever modified the baffles on one of these system?
Any other suggestion?

As I said a bonehead rookie move.
Bucaman

 

Sorry guys.
'94 Heritage..80"

 

I was never a believer in "back pressure." I believe in tuning your fuel to match the rest of the system and less back pressure is better. I seriously doubt you will be happier with a more restrictive exhaust. So, I suggest "run what ya brung."

 

Assuming the " EV27 upgrade " means you have replaced the cam on a carburated EVO . and the " stage 2 upgrades " refer to your carb.?
If this is the case , you can jet the carb. to the pipes as suggested or try another set of pipes etc. etc.
Trying to fine tune a fuel system to an aftermarket exhaust system to obtain maximum power @ a specific power band can be a very intricate process.
I suggest you contact the good folks at Andrews Cams and enquire as to what
would be the best carb. and exhaust for your cam.

 

PM Dk custom to see if they have some thunder baffles for those pipes

 

I am running a Dales Killer 40mm CV w a 195 Main and 50 Pilot, 3 stage needle w clip down 3.

 

Very unpopular belief, but very true.

What makes an exhaust work well, especially down low, is the absence of reversion. Most exhaust systems increase the back pressure, which does reduce reversion. So folks think back pressure is good.

However, back pressure is also like dragging dead weight...it is working against the engine.

When they feel more power they think the back pressure is what gave it to them...but what really gave them more torque (felt power or dyno verified increase in torque) is the reduction of reversion.

What is far better is to achieve faster exhaust gas velocity/less reversion WITHOUT an increase in back pressure.

This is what the Patent Pending "W" Thunder Torque Inserts do.

The TTI's will improve low and mid range torque on every pipe we have tested them on. They're easy to install, cost less than $25, do not work against the engine like restrictive baffles do.

More details HERE.

To the OP, using the TTI's in your exhaust will wake up the low and mid range in the pipes you have.

 

To the OP, using the TTI's in your exhaust will wake up the low and mid range in the pipes you have.[/QUOTE]

You have my attention. Can you walk me through it. I watched your video.
I would pull the baffle from my collector and replace it with your product?

 

You have my attention. Can you walk me through it. I watched your video.
I would pull the baffle from my collector and replace it with your product?[/quote]


They are not a restrictive baffle, so you can leave the baffle in or pull it out. The TTI's will work either way.

They bolt into the muffler, anywhere from 1" to 6" in from the tail end. The best place to put them is in the bolt hole that holds your baffle in. If you opt to leave the baffle in, then it will hold your baffle in place.

All will have a nice increase whether the baffle is left in or taken out. Some bikes will have even a bit more torque with the TTI AND the baffle, some will have more with just the TTI.

With just the TTI and no baffle, it will be loud.

Here are a couple of charts showing the improvement by just adding the TTI's.

 

So if back pressure does nothing how do you explain that when you install something as simple as a 1/4in bolt in a set of straight open drag pipes the torque numbers will increase as much as 3ftlbs this is not picking the best dyno runs either this is with an average of multiple pulls. Many other companies have done this with baffles over the years and if you see a bike at the drag strip running straight drags look in the end of the exhaust I bet most have some sort of back pressure device