Here is a link where several 2-1 and 2-2 pipes were tested on a 95" build. Drop down to post 12 and 13. https://www.hdforums.com/m_546476/tm.htm. I put these in order of torque numbers. Thunderheader and Bassani out performed the Supertrapp. Not by a lot, but enough. It also depends on which number you are comparing, torque or HP. For torque Thunderheader 2-1 were king, and for horsepower the Bassani 2-2 outperformed everything. All of the numbers are subjective. Two different people can get very different numbers from the same pipes depending on the controller they chose, the air cleaner (ness, SE, force whider, etc), even the dyno used.

Hot Bike just tested 3 pipes on a stock 2007 FLTRI.
D&D Police Interceptor slip-ons HP 65.28 TQ 79.46
Bassani Road Rage (2-1) HP 68.4 TQ 83.33
Rhinehart True Duals HP 69.19 TQ 83.13

Seeing that it's torque that gets you moving the Bassanis barely beat out the Rhineharts.

 

1/4 of 1% difference between the Bassani and the Rineharts in this test is pretty much a dead heat. I don't know what the accuracy of a dyno is (or the operator) but you have to give at least 1% for that. It would be intersting in comparisons like this to see if there was a major difference in where the peak numbers were made, up or down the scale. I wonder how much of a difference it takes to be able to feel it on the butt dyno?

 

Come on people you can't compare any 2-2 to a 2-1 just by looking at the peak TQ & HP.I went from True Dual Rineharts in 2005 that had 103lbs of peakTQ, Then I went with a 2-1 Thunderheader that only pumped out 104lbs of peakTQ. But down in the low RPM it had 20more lbs of TQ and over all had 8 more peak HP. Every build is going to be different along with all the different exhaust systems available. I'm sure I could get better #'s with a different 2-1 but I like the sound of my Thunderheader so it will be on my RK until it falls off.

 

Torque is what ya "feel'... but compariing a 2 into 1 vs. Duals, vs. Slip-ons is pointless!

To the original question... if you are looking for "PEAK" numbers, then the answer is probably the Super Trapp. However, if you care about power where you use it most ofter.. then it's probably the D&D FatCat. The FatCat makes big torque much earlier than the others, but does not "peak" as high.

It really depends on what YOU want/like...

 

Deathwind,

The 0.2 difference in torque would not be noticeable! Also, it may be due to error in the dyno.

With close numbers like that,I will stick with my Rinehart TD's!

 

Thats a simple answer..a 2-1...question wasnt what brand.

 

That would have to beany 2-1 because it's about 30 lb's lighter [sm=happybounce.gif]

My vote would be for the D&D fatcat and Supertrapp's for power you can feel when you twist the throttle!!!

 

For most bikes Supertrapps are best.....BUT.....depends on combination of parts and noise you are willing to live with.

 

04 Road King, what do you think of the sound difference in the Reinhart T/D's and the Thunderheader.1 of these 2 brands isreally the way I leaning. In my area we have tons of bike with reinharts but I have yet to run across anybody running Thunderheaders. But I've heard they nice pipes. Useable realpower is what I am wanting, And also a exhaust system that can grow with a later big borebuildup.

 

Just realized that the link in above post didn't work. Here is a ranking of 2-1s and 2-2s. https://www.hdforums.com/m_546476/mp.../tm.htm#546476(post number 12 & 13)

In that test of 19 pipes on one bike the Thunderheader was the king of Torque (100.7) and the Bassani Pro Streets (2-2) were the king of HP (101). This test was from American Thunder's Night Train build.