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HP2 / R1200GS Exhaust Compatability?
Moderators: blackSP, space, greatx
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LtcOliverNorth
Thu Oct 12 2017, 02:29PM
Registered Member #964
Joined: Wed Oct 11 2017, 05:23PM

Posts: 23
Been searching all over, but I've only found bits and pieces of info and no definitive answer.

Will a R1200GS slip-on fit an HP2?

From what I have read, it seems like it would, but that the departure angle of the R1200GS exhaust may be flatter so a hanger extension would be required... can anyone confirm?

[ Edited Thu Oct 12 2017, 02:32PM ]
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space
Tue Oct 17 2017, 11:09PM
a/k/a Jake

Registered Member #15
Joined: Sat Jan 17 2009, 08:28AM

Posts: 227
Slip on should work fine. The difference in departure angle is due to the difference in the cat or y pipe.

I have a R1200GS cat on my bike, which puts the exhaust a bit lower. I need a 1.5" hanger extension to attach a Remus slip on.
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LtcOliverNorth
Tue Oct 17 2017, 11:47PM
Registered Member #964
Joined: Wed Oct 11 2017, 05:23PM

Posts: 23
Awesome, thanks for the info!

Going to order me an R1200GS slip-on and see how it goes. My bike came with Remus headers, so the departure angle should be higher I think...
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LtcOliverNorth
Thu Oct 26 2017, 02:08AM
Registered Member #964
Joined: Wed Oct 11 2017, 05:23PM

Posts: 23
Ok, so here's the scoop in case anyone is interested.

BLUF: Yes, it works.

I picked up a new old stock Akrapovic full system for an R1200GS. I fitted the slip-on portion first and the exhaust and hanger bracket lined up with the HP2 no problem. The slip-on portion had quite a bit of adjustment so even if the original headers were lower-exiting, you should still be able to raise the exhaust high enough to use the exhaust hanger as-is.

I then installed the full-system on the bike starting with the headers. Everything went together fine, but I did have to make some adjustments to my Touratech HP2 skid plate. I had to widen the curve on the left hand side by about 3/8" because the R1200GS header poked too far forward and prevented the skid plate from lining up with the engine mount. I also had to remove material from the rear-most hanger (and flip it backwards) to get it to clear the mid-pipe (the mid-pipe cuts over to the left earlier than stock). The muffler went on no problem, and lined up perfectly again.
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SnoDawg
Thu Oct 26 2017, 05:30PM
Registered Member #659
Joined: Sun Apr 28 2013, 05:27AM

Posts: 137
do you have any pictures of the final result?

I need to find a slip on with a spark arrestor to legally ride in the woods near my house.

Thanks,
Jeff
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space
Sun Oct 29 2017, 09:15PM
a/k/a Jake

Registered Member #15
Joined: Sat Jan 17 2009, 08:28AM

Posts: 227
Snodawg, can you fit one of those cupped screens on the end of your exhaust?

Or if you've got a cat still on, that's functionally a spark arrestor. Never mind that a cat gets hot enough to light underbrush on fire. Still legal, so it's OK ....

I've got a Remus can on mine. Not sure it has much of a screen inside of it, but it's been inspected by CA forest service agents who OK'ed it. And if it passes in Cali, then it probably passes everywhere.
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SnoDawg
Mon Oct 30 2017, 03:54PM
Registered Member #659
Joined: Sun Apr 28 2013, 05:27AM

Posts: 137
Hey Space -
That is a great suggestion and I actually did just that last week. I drilled the rivets, repacked the exhaust and put in a small stainless steel wire mesh sink drain. I had to cut the inside baffle about 1/4 inch. It went together fine and I rode 175 miles on Saturday in the south Jersey Pinelands for the PB500. This bike is such a blast in the woods and it has so much power. I will try to attach pics.






and a pic of my MAD MAX - rat rod exhaust
you gotta love the mix of Carbon Fiber with rusty metal and rivets. It sounds amazing!




[ Edited Mon Oct 30 2017, 04:22PM ]
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LtcOliverNorth
Tue Oct 31 2017, 01:02PM
Registered Member #964
Joined: Wed Oct 11 2017, 05:23PM

Posts: 23
Pictures Attached... strange that the forum does not like vertically-oriented pictures.












[ Edited Tue Oct 31 2017, 01:05PM ]
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SnoDawg
Tue Oct 31 2017, 04:59PM
Registered Member #659
Joined: Sun Apr 28 2013, 05:27AM

Posts: 137
OK
I am jealous of your exhaust, but how does it sound?

Jeff
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marret
Wed Nov 01 2017, 06:21AM
Registered Member #875
Joined: Wed Dec 16 2015, 09:39AM

Posts: 23
Yeah, me too. Nice. I do have the BMW Akrapovic slip on.
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LtcOliverNorth
Wed Nov 01 2017, 03:07PM
Registered Member #964
Joined: Wed Oct 11 2017, 05:23PM

Posts: 23
It sounds amazing.

So amazing, that I ended up ordering a slip-on Akra for the 1200GS.
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