Fulldraw this was the only info i could find on the thunderheader so far but i will continue my homework. thanks for all the tips.
The Dyno tests
The Xccelerator vs. the ThunderHeader
th
5/28/2002
Click to enlarge dyno chart
In an effort to become the best exhaust manufacturer on the market, Hard-Krome has been extensively testing our line on the dynamometer. Countless hours in our new state-of-the-art dyno room will ensure not only will your pipes look good but they will also perform better than anything else.
We wanted to offer the best 2-into-1’s on the market. With so many other exhausts available, we knew that our pipes had to be unique. A pipe that performs well but detracts from the overall look of the bike would not be the answer. It has to look as nice as it performs. We started out with our patented Double Wall construction. The outer pipe has a vented back, which allows the hot air to flow out and the cool air in. This allows the chrome to stay perfect from day one. A guarantee we stick to. This eliminates the hassle of bolt-on heatshields. You don’t have to worry about rattling or broken hose clamps.
The ThunderHeader has been considered the #1 2-into-1 system for your Harley. We decided that in order to be number one we had to beat number one. We started with a 2000 Fat Boy 88B twin cam for our testing. We added a Dynojet Stage 1 jet kit and a Rivera Smoothie air filter. The initial dyno test showed the stock Fat Boy put out 65.6 horsepower and 76.6 ft.-lbs. of torque.
Next we installed the 2-into-1 ThunderHeader. The ThunderHeader showed a peak horsepower of 72.8 and 82 ft.-lbs of torque. The pipe performs quite well. The gain in overall horsepower was 7.2 horsepower. During the test we noticed some discoloration at the collector and carbon deposits at the rear of the pipe.
Finally we installed the Hard-Krome 2-into-1 Xccelerator on the Fat Boy. Installing the pipes was a snap. Without having to add bolt-on heatshields aided in the ease of installation. We knew it was going to be tough to outperform the ThunderHeader. And yet, we were able to gain a max horsepower of 73.4. That’s a gain of almost 8 horsepower by simply installing the pipes. Not too bad. Overall torque was the same as the ThunderHeader. With 4 ft.-lbs of added torque, the 2-into-1 Xccelerator will help you off the line.
All in all, we were quite impressed on how the 2-into-1 Xccelerator performed. We were able to gain an advantage in horsepower over the ThunderHeader by a full horsepower. At last a product that performs as well as anything on the market and it will not discolor. We are so confident that our pipes will not discolor we are offering a 1-year guarantee against blueing. Why settle for anything less?
