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Popular, but they sound crappy in my opinion. Very raspy and a lot of "crack" and missing the heavy bass noted you get with a Thunderheader.
I heard a D&D the other day on a 2007 FLHX and it sounded like total crap. They might have good performance, but the sound is less than pleasing. Thunderheader or bassani.
I did a lot of research on 2 into 1 exhaust systems and it boiled down to whether you are looking for performance or looks (or a little of both). When you look at numbers RB Racing makes the best power, a lot of people don't like working with these guys as they can be a little independent. D & D "Fat Cat" is probably used more than any other for a combination of good power, looks and cost. All I can really give is my experience and that is I gained 8 HP and 10 ft.lbs. of Tq. when I changed from a Samson "Calibre" 2 into 1 to a RB Racing, I will also say that the Samson was far better than the HD Screamin Eagle duals that I startd with. I do have a good bit of engine work ie: Heads, JIMS cylinders, 10.5 CR, Cams, etc., etc.
I have tried EVERY 2-1 made on my ol 08............LSR 2-1 made the most power!!! Gonna order one for my Ultra Limited this week!!!
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2010 FLHTK
Stage 1, 2-1 LSR, SEST
255 Cams
Dont know what the BEST is, but I have no complaints with my Black Fatcat. I think the fact that your considering a 2-1 is a step in the right direction performance wise.
Had a guy tell me the other day,
"I hate those 2-1 pipes, your bike doesnt even sound like a harley"
I just smiled and replied
"thats ok, it doesnt run like one either"
Fatcats - 2 bikes and 2 sets of them. Bar none, IMHO the best thing available. Outstanding quality and support.
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D&D Fatcats & Power Commander - Hawg-Wired
ELECTRA GLIDE CLASSIC
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FORMER SCOOTERS (See my flickr pages for some of them) http://www.flickr.com/photos/22481635@N05/sets/