View Poll Results: Which would you choose
Akrapovic (Dip but higher HP)
1
10.00%
D&D (No Dip lower HP)
9
90.00%
Voters: 10. You may not vote on this poll
Which Dyno Chart? Want opinions please
Thread Starter
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Outstanding HDF Member
Joined: Jun 2011
Posts: 3,036
Likes: 19
From: Savage, MN
It's incredible how much the pipe makes a difference. I was assuming that I would be better all around including HP with the D&D but no such luck. The fat cat would probably have charged the curve and kept the numbers but I had to give up some power for my no cutout stretched bags. I was assuming logically that the shorter pipes help with HP and the longer ones help with tq but there is obviously some variances in there.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
The diameter of the head pipes, along with the length(s) and the diameter of baffle will effect things. Also the temp and humidity on the day the dyno was done. Don't assume that the D&D actually made 10 hp less than the other exhaust unless you have them tested back to back. Also the Akropovic may very well feel faster due to the kick it will have when it comes "on the pipe" but have poorer roll on manners.
Last edited by qtrracer; Mar 29, 2016 at 04:33 PM.
Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 877
From: Iowa
I would say it depends on how you ride. If your aggressive and like to accelerate without down shifting go with the D&D. If you do a lot of highway miles and cruise around 3K a lot I would go with the Akra. I say that because you will get a lot better milage with a slight HP plateau at cruising speed and will be able to maintain speed a lot easier. You would have to downshift to pass though. If you are doing something to up the compression, then definitely go with the Akra, you will get rid of most, if not all, of that dip.
Thread Starter
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Outstanding HDF Member
Joined: Jun 2011
Posts: 3,036
Likes: 19
From: Savage, MN
Good points gents, I also thought about the conditions factor as well being the last tune for the akra was mid winter with some nice cold dry air and the other was done yesterday with more mild temperature air and more humidity. I replaced the akrapovic with the D&D so I am not going back. There are some other positives with the D&D as well like sound being further back and not quite a s loud. I also like the look of the D&D better I didn't at first but its grown on me.
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Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
If you do a lot of highway miles and cruise around 3K a lot I would go with the Akra. I say that because you will get a lot better milage with a slight HP plateau at cruising speed and will be able to maintain speed a lot easier. You would have to downshift to pass though. If you are doing something to up the compression, then definitely go with the Akra, you will get rid of most, if not all, of that dip.
Wow, this may be the most inaccurate comments I've ever read online..........yeeeaaah woooaaaa.
no offense personally. you may be a nice guy.