The D&D Fat Cat is one of the best kept secrets of the Harley Davidson world. The D&D Fat Cat does not fit the traditional mold of what you think of when you think Harley Pipes mainly because it is a 2 into 1 pipe.

Traditional Harley Pipes have always been 2 into 2 configuration like a traditional pair of Drag pipes but those in the know will tell you that the 2 into 1 Harley Pipe design is the ticket when it comes to performance.

My experience would verify that thought process as well.  I replaced a set of Vance and Hines Big Shot Staggered pipes with these D&D Fat Cats and it was a very noticeable change.   These pipes really shine in the low and mid range rpm range and significantly improve the torque produced by the V&H Big Shots.  That's perfect for a street ridden Harley Davidson, as we spend 99% of our time at moderate RPMs.

Big horsepower numbers are sexy, but torque is king on a street driven bike.

D&D Fat Cat Harley Pipes

The bike in the picture is my own 2007 FXSTB or Nightrain in case you aren't familiar with the letter designation.   I have snorked it up a little bit with a 107" cylinder kit with a set of Josey Wales Cams, Stage 2 ported heads, pipes, a Daytona Twin Tec and a few other goodies. It's a pretty hot setup and gets down the road pretty good but I didn't realize how good it could be until I put a D&D Fat Cat pipe on the bike.

The install was a piece of cake.  I change my pipes often and this one was one of the easier to install.  The hardware on the D&D Fat Cat is rugged and the pipes fit together nicely.  If you can rub your stomach and pat your head at the same time then the installation won't be a problem.  I had mine on and running in about an hour. I haven't dyno'd the bike since the switch so I don't have any hard numbers but the difference on the butt dyno was definitely noticeable.   It was so noticeable it actually brought a grin to my face, because this thing RIPS!

What was almost as good as the improvement in power was the wicked exhaust note that the D&D Fat Cat provides.  It's nice and deep at idle and part throttle but when you crack the go throttle, these pipes WAIL and will really let anyone behind you know who's boss.  Guaranteed grin machine and perfect for most of us.  I don't like a really loud bike and at part throttle this thing is very civil, but a beast is just a crack of the throttle away. I dig it.

Easily one of the best sounding Harley Davidson pipes I have ever heard. I have to tell you....I didn't think I would like these pipes, I put them on because I wanted the most power possible. After getting them on the bike, you couldn't pry these suckers away from me with a crowbar.  I love them.

D&D Fat Cat Fit and Finish

The Fit and Finish was surprisingly good. D&D is a smaller company compared to say a Vance and Hines or someone like that but you would never know from the way the pipe was designed. I had them on the bike in about 60 minutes and the finish on the chrome was some of the best I have seen from any manufacturer. I know this may sound like a one sided review but I like these pipes that much. They fit right, they look right, they sound right and most importantly they perform right.

The only downside is they are not recommended for lowered bikes and from experience, they mean that. The Muffler body on the D&D Fat Cat hangs low and has a decent diameter so it will easily drag on right turns on a lowered bike. D&D has answered the call with a new version of the Fat Cat called the Low Cat. The D&D Low Cat offers an upswept muffler position for the lowered bikes.  As you can see from the image, I may have some issues on right turns.  I don't care, I like em.

If you are open to the 2 into 1 design for your Harley Davidson then I don't think you will find a better pipe than the D&D Fat Cat for Harley Davidson.  It's a great pipe, I bought mine on Ebay and saved some dough versus the catalogs and even found some that offered free shipping. Check em out.  If you've been considering this pipe, then I would wholeheartedly say that you won't go wrong....just think twice if your bike is in the weeds like mine.