PDA

View Full Version : Duncan fat boy 4?


Mxracer53
07-12-2005, 11:02 AM
How does the duncan exhaust compare to the tc shorty rossier shorty, Spark bc, and pc?
K-Dub
07-13-2005, 05:41 PM
I 2nd his question. I always ran Paul Turner pipes on my 250R and recieved great customer service from Duncan Racing. So if there pipe is comparable to the Rossier I would like to stay with Duncan. Is the fatboy 4 a bottom- bottom to mid -mid- mid to top-or top end only pipe?
Mxracer53
07-13-2005, 10:35 PM
bump
yfz450admirer
03-16-2006, 05:40 PM
bump
jeepnrocks
03-16-2006, 06:03 PM
I remember reading an article in one of the mags and I dont think they liked the fat boy 4. Said it made the 450r power band even more mellow. NOw I know its a mag so don't crucify me. Just relaying what I have read
03-16-2006, 09:01 PM
Originally posted by jeepnrocks
I remember reading an article in one of the mags and I dont think they liked the fat boy 4. Said it made the 450r power band even more mellow. NOw I know its a mag so don't crucify me. Just relaying what I have read

ya i heard the same thing about making the powerband mellow, if it was me id just go with a DASA exhaust system
jd400
03-17-2006, 06:27 AM
I had a FMF Factory 4 on mine, and I switched to a Fat Boy 4. I gained quite a bit of low end with the Duncan compared to the FMF, and I didn't seem to lose the top, either. Not that this info will help you out too much, though...
MMcCannon
03-26-2006, 07:36 PM
I also am curious about the Duncan. Has anyone else ran one?
DGS
03-27-2006, 08:44 AM
I run the fatboy4 and liked the bottom end gains. didnt feel like it mellowed out the power at all. i got an 06 kicker....:)
MMcCannon
03-27-2006, 11:27 AM
Has anyone been able to find a soundclip of a Fatboy 4 pipe? I really want to hear one.
Yamahauler_04
03-27-2006, 03:48 PM
It does a little on the top, but mostly a bottom and mid increase.

Real rideable power. They are also selling a quiet series for those getting hassled for sound. Passes the WORCS sound check.

Of course I am biased.
Crashmore 22
03-28-2006, 08:33 PM
When I got my 06 I was a little dissapointed with the power. I purchased a Fat Boy 4 and a pro flow intake and now I have all the power that an XC racer could EVER need. It makes the bike pull harder from the bottom to the top, especially in the midrange.