debaffled stock exhaust back pressure - Victory Forums - Victory Motorcycle Forum
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post #1 of 50 (permalink) Old 04-12-2017, 03:25 PM Thread Starter
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Default debaffled stock exhaust back pressure

Hi, I have been researching and need some help before I attack this situation.
I debaffled my exhaust and love the way it sounds, but I understand that I might have lost back pressure. I read somewhere that a bolt inside the pipe will help getting back some of the BP.
Can someone guide me thru this?
thanks in advance.

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2008 vulcan 900
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post #2 of 50 (permalink) Old 04-12-2017, 04:22 PM
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Originally Posted by tcrider View Post
Hi, I have been researching and need some help before I attack this situation.
I debaffled my exhaust and love the way it sounds, but I understand that I might have lost back pressure. I read somewhere that a bolt inside the pipe will help getting back some of the BP.
Can someone guide me thru this?
thanks in advance.
I'ts a wives tale. 4 stroke engines don't require the back pressure like 1990's 2 strokes did. You did open your exhaust up.. so more air out, more air in... more air more fuel. I have been running debaffled exhaust for 5 years with a VFC and Lloydz intake filter. No issues. The head pipe on XC and XR have the cats in the head pipe.

People have added all kinds of things to their debaffled to make it sound different or stop backfiring. A good tune stops the backfiring. Adding items or baffles will just change the note and disrupt the flow.
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post #3 of 50 (permalink) Old 04-12-2017, 06:02 PM Thread Starter
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ok, so I dont have to worry about messing anything up for lack of back pressure then?
A fuel tuner, timing wheel and air filter are my next mods. I accept suggestions from more experienced members on this matter....

Also was debating about the Air Valve, but I read too many posts that suggests that is not worth it.

Thanks again for the quick response.

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post #4 of 50 (permalink) Old 04-12-2017, 07:10 PM
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If you plan on doing cams the I would skip the timing wheel and get the ECU flashed or get it tuned with the Maximus tuner. You can set the timing better through the ECU and skip having to have the timing wheel and PCV. You get a smoother power band from what I have seen and you have no addon parts that could fail. You keep the Maximus tuner with you VIN in it and your tuned map so if you ever have ECU problems in the future you can reinstall the map yourself.

I see you're in Florida, they are having their annual Spring Horsepower weekend in Southern Maryland in May. Hosted by one of the top 5 Victory guys, arguably the best Victory tuner out there. Installs, dynos, deals and fast rides with some forum members through the back country.

I was going to copy the info but I will tag @half_crazy and let him, it's kind of his baby. So if you want to pop wheelies, this is the event to go to. I would definitely go if I could.

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post #5 of 50 (permalink) Old 04-12-2017, 07:52 PM Thread Starter
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I hear you, but cams are way out of my budget yet, maybe in the future... Do I have to add a PCV if I install the timing wheel ? Or can I do without the PCV for the moment ?

I will check the Spring Horsepower, thanks for the tip.

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post #6 of 50 (permalink) Old 04-12-2017, 08:32 PM
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the timing wheel isn't going to adjust your air/fuel mixture and get rid of the backfiring. You can get a stage 1 flash from a dealer, you can get a Victory Fuel Controller (VFC), PCV, etc.

I don't want to answer on the timing wheel question, as I have avoided installing it. Not because I don't approve, they are great. I just haven't had the need and now with the other options of tuning available, if you plan to add cams then the timing wheel is a waste IMO.

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post #7 of 50 (permalink) Old 04-13-2017, 05:09 AM
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2017 Horsepower Weekend (So. MD)
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post #8 of 50 (permalink) Old 04-13-2017, 01:21 PM
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Put the timing wheel in now. It will not cause and problems and you'll not need any tuner


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post #9 of 50 (permalink) Old 04-14-2017, 10:19 AM
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I recently debaffled my Freedom Performance pipes by removing the rear sections with the spiral louvres and getting some plain 2" exhaust pipe bent to suit.
Open pipes sound obnoxious so all I did to mellow it a bit is weld a washer to a bolt and drill a hole to fit it inside the pipes 4" from the end.
The difference is phenomenonal!!
Has to be heard to be believed.!!
Picked up a bit over 5 hp on back to back dyno runs!
Here's some pix.
Simple washer on a bolt commonly called a lollipop baffle....it works!
Attached Images
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Victory Vegas 2010
100 cube / 6 speed

Lloydz 109"cube big bore
Lloydz. 495 cams kit
Lloydz Torque Tube Intake
Freedom Performance Slash pipes debaffled
Lloydz timing wheel @4 deg. and IAV
Barnett clutch spring
Barnett +6"cable
Lloydz Primary plate.
PCV
'Powerhouse' Dyno-tuned.
Progressive 465 rear shock
RaceTech Gold Valves and Progressive fork springs.
18" XC front wheel
1 3/4" (45mm) 'Burleigh Bars'
Stebel air horn.
12.6@105mph

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post #10 of 50 (permalink) Old 04-14-2017, 01:26 PM
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I've been thinking about having a baffle made or modifying one to fit my bike. I'm upgrading the stereo and the debaffled is getting to be a bit much for me on the long rides or anywhere there is a wall/mountain next to me.

The XC exhaust still has some mesh inside when you remove the baffles, it's not just a pipe but the lollipop idea might work to tone it down a bit. It would be cool to have the ability to twist them open/closed for when you do want it loud as a screaming banshee. I love screaming through tunnels with the loud exhaust lol. Must be my inner child.


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