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Old 12-04-2012, 12:15 PM   #11
Beastly Adventurer
planemanx15's Avatar
Joined: Dec 2009
Location: Long Island, NY
Oddometer: 1,009
Originally Posted by ER70S-2 View Post
Those numbers are for the stock muffler

Stock Mufler Inlet:
I.D. = 1.4"
O.D. = 1.51"

Stock Muffler Outlet:
I.D. = 1.135"
O.D. = 1.265"

Years ago I made a midpipe for the DR using 1-1/2" O.D. exhaust tube. It slid inside the stock exhaust pipe with the stock gasket (by your ankle). It was a proper slip fit.

The midpipe from Kientec is 2" O.D. (on the bike now). At the front (ankle), since it uses the stock gasket, I think it is also 1-1/2" O.D. into the stock exhaust pipe.

So I'm guessing that you need to get from 1-1/2" O.D. at the front (exhaust pipe connection), to 2" O.D. to match the Hayabusa inlet. The second pipe in the photo.

Goin' ridin' Be back later to answer any more questions.

From Kientec: (wowie, big pic )
Thank you so much! That just explained everything for me. I'm going to try and do this Thursday or Friday. I'll report back on this thread when complete.
2000 Suzuki DR650-790 - 790cc Big bore build thread
1985 Yamaha CA50 - The little scooter that Could
2009 Piaggio BV-250 - Escusi, Babba be bo-bee
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