It reduced the sound level by nearly 10 dB from the stock Two Brothers M2 carbon fiber exhaust.
This didn’t start out to be a three-part review but one never knows what the future will bring.
We received so many emails about our P1 Power Tip review that we figured we may as well make it a threesome.
So a Two Brothers P1X Power Tip was ordered and it arrived quickly…along with the correct high-temp O-rings in the kit.
The P1X is quite different from the P1 Power Tip. It has an inner extension tube that’s 30 mm in diameter (ID) and the exit tube has a 38 mm diameter.
This compares to the P1 Power Tip that does not have the inner tube and has an inner diameter of 47 mm.
As we discovered in Part 2, the P1 Power Tip did nothing to reduce the sound from the M2 exhaust on the BMW F800S (Blog) and, in fact, it made the exhaust sound slightly louder.
No problem with the P1X however, so if you really want to reduce the sound level from the ~99 dB level of the stock M2 exhaust, the P1X is the way to go. It reduced the sound by nearly 10 dB in our comparison.
We revised the Two Brothers exhaust video to include both the P1 and P1X clips, so now you can watch the entire 4-minute-and-change video and see (and hear) all three versions.
The Two Brothers P1X Power Tip does make both a subjective and objective difference, reducing the sound level of the M2 carbon fiber exhaust in our example by nearly 10 dB in the RPM range illustrated in the video. Since the P1 Power Tip had no effect in our evaluation, the P1X is the one to buy if you’re looking to tame the sound in a Two Brothers exhaust.
From “M.H.” (February 2015): “I fitted P1X power tips to the Two Brothers mufflers on my Suzuki DL1000. Changed it from obnoxious to just loud, almost acceptable. A definite improvement.
I then bought some tubing which had external diameter identical to the internal diameter of the tips, cut to lengths of approx 15 cm, drilled holes along the length, and attached to the power tips running up inside the mufflers. This made it very acceptable, still leaves the DL with a good throaty v-twin sound, and doesn’t seem to have impacted the tuning or the performance. I’m happy!”