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Old 11-11-2010, 05:54 AM   #1
Krusty ... OP
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DR650SE Index Topic #11- EXHAUST

The factory muffler is not nearly as restrictive as things are on the intake side, but there is some corked-up power to be found by switching mufflers. But often the attraction of swapping exhausts is just as likely to be the weight savings, as the stocker weighs in at nearly 15 pounds.

Please share your exhaust improvements...


-GSXR MUFFLER
-AFTERMARKET MUFFLERS
-HEADER GRIND
-OVERSIZED PIPES
-SPARK ARRESTORS
-POLISHING HEADER
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Old 11-11-2010, 07:27 AM   #2
eakins
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ground header welds & gsxr muffler here.
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Old 11-11-2010, 07:29 AM   #3
monkeyfez
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Quote:
Originally Posted by eakins
ground header welds & gsxr muffler here.
ditto. Works great. SOunds nice. Not even a little loud just nice. Much lighter and with the carb/airbox mods made a nice improvement. Also it just looks better than the stocker.
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Old 11-11-2010, 01:23 PM   #4
GutterTrash
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i managed the header grind a couple weeks ago, definently sounds like it breathes better, got a little throatier.

the over-weld was a good 1/4 inch all the way around with a spot where the welds overlapped to about a good 3/8

scored a mis-labeled gsxr1k can last week off fleabay and saving up for the mid kit now,,, unless i can do as good with homemade. might still checkout the home brew route.
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Old 11-15-2010, 05:52 PM   #5
ER70S-2
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Stock exhaust dimensions:

Inlet: ID = 1.4"; OD = 1.51"

Outlet: ID = 1.135"; OD = 1.265"

If they removed the stock inner tube (the one that sticks out about 1/4"), when gutted, that will leave a hole; ID about 1.386"

FMF Model #S9000 Approved Spark Arrestor (thanks to mx_rob)(also available at Dennis Kirk, I think), is 1.650" OD and 3.38" long

For reference the GSXR muffler x40F0x outlet; ID is 1.680"

GSXR install (again thanks to mx-rob):
https://docs.google.com/present/view...c203OWhm&hl=en
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Old 11-25-2010, 01:50 PM   #6
mr openroad
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for the cost the gain in my opinion is not great enough, I just assume put that money into a bigger piston or suspension mods.
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Old 11-25-2010, 04:45 PM   #7
sandwash
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D&D with 2 brothers mid pipe
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Old 11-28-2010, 09:01 AM   #8
Krusty ... OP
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Bump
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"...choosing a DR indicates an affinity for peace, harmony and enlightenment. Serenity lies in accepting it as it is, changing what you want, and the wisdom of knowing it ain't orange." -psmcd
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Old 12-09-2010, 01:44 PM   #9
NYTrainer
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DR 650 Intake/Exhaust Mods

The bike had the Dynojet carb kit & cut airbox when I bought it.
I added K& N Filter, FMF Q4 Muffler W Powerbomb Header.
Big savings in weight & improved power, but a little loud!
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Old 12-09-2010, 05:02 PM   #10
plugeye
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gsxr-1000 TI can
a bit vocal for me, but hard to hush a big thumper without killing it
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Old 12-24-2010, 08:55 PM   #11
ER70S-2
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Eek Exhaust Header Glowing Red

http://www.advrider.com/forums/showthread.php?t=621819

http://www.advrider.com/forums/showp...ostcount=46996
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Quote:
Originally Posted by Threewheelbonnie View Post
"BTW, I don't do style. It's a dirt bike, not some girlie dress-up thing." -

ER70S-2 screwed with this post 04-04-2011 at 12:38 PM
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Old 12-26-2010, 02:56 AM   #12
rivercreep
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I'm using a cheap CZR pipe for the winter so it can take the beating from the salt instead of the stocker.
Really too loud for my tastes but, it's not like I'm off-roading the thing in the winter (more commuting). F.W.I.W. Since I had already rejetted for the air-box mod she really came alive all over the rev-range. What's really funny is that even after re-gearing 4 teeth bigger on the rear, my mileage has stayed the same with an avg. of 54mpg.
This spring I'll be looking into the 2-bros pipe with the added noise restrictor. (I've really grown to like the big singles sound...just not quite this loud)
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Old 12-26-2010, 08:08 AM   #13
RED CAT
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Careful!

Sometimes these changes come at the expense of loss of bottom end power which on a DR is a no no. You can easily gain top end and drop a little weight get more noise which you think means more power but lose that precious bottom end. Fine idea on a sreet bike but lousy on a dualsport. You usually end up losing gas milage too. So be very careful with so called power mods.
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Old 01-04-2011, 09:59 AM   #14
sandwash
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Quote:
Originally Posted by RED CAT View Post
Sometimes these changes come at the expense of loss of bottom end power which on a DR is a no no. You can easily gain top end and drop a little weight get more noise which you think means more power but lose that precious bottom end. Fine idea on a sreet bike but lousy on a dualsport. You usually end up losing gas milage too. So be very careful with so called power mods.
Thats not going to happen with this bike,but hey the pumper carb will take care of that.
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Old 01-10-2011, 07:24 PM   #15
thumpididump
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2001-2003 GSXR muffler, with the modified Two Brothers mid-pipe as sold by Kientech (it includes muffler gasket and mounting hardware).





OEM header pipe, after an evening with a wire wheel, emery cloth, steel wool, cotton buffing wheel, Autosol metal polishing cream, and lots of elbow grease.





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