Back in April I had my bike tuned after I installed a set of Andrews 48H cams. Rinehart Extreme duals with 4" mufflers.
I'll attach the sheet.
Next post will be the results of another tune with the only difference being a 2-1 pipe.

 

Today I had the bike retuned after installing a RB racing Pro Stock spyder 2 into 1 exhaust. Maybe the Duals are not as bad as everyone thinks!
Same dyno, same tuner.

 

Waiting with baited breath here

 

Interesting results. I'll admit it's not what I expected.

 

Don't pay attention to the big dip. Tuner said he let off and hit it again. I know, sounds lame. It was 14* warmer and 26% more humid too.
1 ft lb more torque with the exact same HP. At least the Torque curve looks a little higher throughout most of the rpm range.
Bike runs great! But I thought the numbers would be a little higher, especially down low.

 

You can't compare the results if it was 14 degrees hotter and more humid. That's like racing uphill and then comparing it to your downhill time.

 

Doesn't the results adjust for weather? It was only 75 today (high for Oct in Michigan) but maybe it was that high in the dyno cell. That's what the sheets says for both runs.

 

I'm not the biggest rb fan, but I'm Impressed with the true duals lol

 

Does the AFR trace look as good on the 2-1 sheet as it did on the duals? It got cut off on your scan.

Zach

 

There is a second sheet with the AFR. It looks great.