muleskinner
Turbocharged
Here is an idea I had for the stock touring air box. I got the idea from a guy named "Turbo Tom" who has a performance bike shop in Orange County, CA. He did the same thing for the Honda ST1300 and everyone who did it claimed a power increase.
Our air filters have the same size opening at the top and bottom. The bottom sits on the bottom of the air box with no opening. I pulled the air filter out and found there is a raised ridge to seal the foam ring on either end of the filter at the bottom of the box. In the middle is a flat surface with a drain tube.
I took my flashlight and looked under the bike to find the bottom of the air box sits above the starter unobstructed. So, using a 2 1/2" hole saw, I made two holes in the bottom of the air box between the hole on the bottom of the air filter. One at each end. I then took a hot knife and trimmed the middle section between the holes out, creating a perfect match for the bottom of the air filter opening. The raised edge still seals the bottom of the air filter, but I now have an air inlet at the bottom that is the same size as the air inlet at the top. This has to add air flow to the bike. I have included some pictures for reference.
Our air filters have the same size opening at the top and bottom. The bottom sits on the bottom of the air box with no opening. I pulled the air filter out and found there is a raised ridge to seal the foam ring on either end of the filter at the bottom of the box. In the middle is a flat surface with a drain tube.
I took my flashlight and looked under the bike to find the bottom of the air box sits above the starter unobstructed. So, using a 2 1/2" hole saw, I made two holes in the bottom of the air box between the hole on the bottom of the air filter. One at each end. I then took a hot knife and trimmed the middle section between the holes out, creating a perfect match for the bottom of the air filter opening. The raised edge still seals the bottom of the air filter, but I now have an air inlet at the bottom that is the same size as the air inlet at the top. This has to add air flow to the bike. I have included some pictures for reference.