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Discussion Starter #1
I have a D&D exhaust on my 954 as of now, but people say that it's loud and obnoxious and I believe different, I don't think there that loud. I don't want to change and buy a new exhaust, so if I cut the can down shorter and re-riveted the end back on the can would that make it any louder and would I lose backpressure? I know some about bikes but not too much, if there's any advice it would be greatly appreciated. Thanks....
 

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Exhaust are design for a reason. you will lose back pressure but how much dont know.... i would just leave it. it is your bike and it never hurts to try
 

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Discussion Starter #3
Well with gas prices the way they are it's my only means for transportation, so I don't want to hurt the bike. I just want it alot louder, I personally don't think D&D exhaust are that loud, any suggestions? Spending the least amout of money possible and keeping the backpressure that is needed?
 

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Is it a full exhaust or slip on? If slip on get a HTEV eliminator and do flapper mod. Ive heard both increase the deep throatyness (is that a word?) of the exhaust.
 

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Discussion Starter #5
What exactly is HTEV eliminator and a flapper mod, I don't really know a whole lot about it and yes it is a slip on. Is there anywhere you can direct me to get more info on these mods?
 

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Look on the bottom of your bike below the engine. There should be an exhaust valve that is controled by a servo motor HTEV ( Honda Titanium Exhaust Valve) Replacing this with a straight through pipe section (sold on the internet or you could try to fabricate one yourself) does good on the deep throaty notes of the exhaust and also eliminates the HTEV rattle that can sometimes be heard. Flapper mod is an airbox mod that allows air to go a more direct path to the engine. I have also heard this increases the desireable notes on the exhaust. If you have a power commander both of these mods work much better as you would be able to retune the bike for them. There are tons of posts on flapper mod throughout the forum, and you can find the HTEV eliminator by typing "HTEV eliminator" in google.
 

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Discussion Starter #7
Thanks....you said something about an HTEV rattle that can be heard sometimes? Is that anytime, because when I crank the bike from cold I can hear a little rattle could this be what your talking about?
 

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Discussion Starter #8
Also if I do the HTEV Eliminator do you also have to do the flapper mod with it at the same time, due to money I might have to do one at a time. Any good recommendations for purchasing these and from where?
 

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Flapper mod is free. If you look in your airbox there is a piece of plastic that opens and closes, you just prop it open somehow (ie tie it down) You also may have to disconnect the servo motor from it, I cant remember, search the forums for "flapper mod"
 

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If you want it louder with the d&d just take the can off and cut out the cone baffle. That will make it louder and its pretty impossible to mess up... and cheap.
 

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I took the cone baffle off my bike before i put my new can on but its still Quiet as... Might try the HTEV mod or can i just pull the valve out?
 

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I took the cone baffle off my bike before i put my new can on but its still Quiet as... Might try the HTEV mod or can i just pull the valve out?
IF you pull the whole apparatus out there will be a gap in the pipes. Search the forums, someone did heavy modification to theirs to make it jsut a straight through pipe. They reversed the mechanicals inside and filled several areas with metal and then ground it down to smooth. Its alot more time and effort than it would take to drop the 100 on the HTEV eliminator. If you got tons of time and no money, go that route, but if you have a job think of how much time you have to work to get 100, this is prolly gonna take you longer than that. The HTEV eliminator is a 15-20 minute install most of the time. If you just pull out the mechanicals from inside it leaves two places open which I think will make alot of turbulence in the exhaust.
 

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Slip ons are a piece of cake to modify. Drill out the rivets and pull the whole thing apart, you'll find some glass baffling shaped like a cylinder and an inner tube with ports. Options to make it louder 1) cut down the glass baffling so that only 1/2 or less of the length is there 2) cut the can down, baffling, and inner tube. I did this on my cheapy brand x slip on and it sounds bitchin now! I ended up cutting 8" out of the length and only using a couple of inches of baffle. Loud=safe IMHO. Good luck
 

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ironic this thread is up just when i was thinking about shortening the can. i'm kicking around shortening it almost in half. want a cleaner stealthy look. have an extra can and rivets to play with.
 

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Hi Flea954RR!
I have cut mine down by half, as Gear-Head said its very easy and the results in "sound" are great! altered the PC111 to compensate!
Before and after:





Good luck!
 

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Wow... the mod looks great!!! That easy huh? Sounds alot meaner??? You said you altered your power commander huh... I have a power comander on my bike I just bought. I havn't gotten into it yet. Are those things very user friendly? How tough is it to tune you bike using them???
 

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IF you pull the whole apparatus out there will be a gap in the pipes. Search the forums, someone did heavy modification to theirs to make it jsut a straight through pipe. They reversed the mechanicals inside and filled several areas with metal and then ground it down to smooth. Its alot more time and effort than it would take to drop the 100 on the HTEV eliminator. If you got tons of time and no money, go that route, but if you have a job think of how much time you have to work to get 100, this is prolly gonna take you longer than that. The HTEV eliminator is a 15-20 minute install most of the time. If you just pull out the mechanicals from inside it leaves two places open which I think will make alot of turbulence in the exhaust.
Where do i get the HTEV eliminator from? Will i be able to get one in Australia??
 

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Won't you need a power commander or similar if you cut your can down? If you reduce an engines back pressure, you will affect the fueling. Low back pressure could make your lump run lean, and possibly drop a valve or whatever. Not like the old carbs where you could just adjust the needles!!
 

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Hi Guys!
As I stated I altered the mixture on the Power Commander after cutting the can, over the course of a few runs and she is running sweet! sounds great and acceptable around town, then realy "barks" when she is opened up!
Have recently changed the Plugs and the mixture looks spot on considering that it has not been remapped on a Dyno, just adjusted on the mixture levels
(Low Med & High)
Regards:smokin:
 
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