30 Minutes Delivers as much as a 10% Increase in Harley-Davidson Horsepower
The following 3 part tech tip instructs the enthusiast on how to install the D&D Slip on exhaust pipes for 2009 FLH Baggers.
We followed the directions above regarding alignment (we didn't need any spacers), then tighten the slip-on mounting plate and the head pipe clamp. The D&D installation instructions made a good point:
“Mount all clamps so they are accessible for tightening or removal.”
Don't tighten any bolts or clamps until the slip-On Boss muffler is hung from both ends. Don't forget to rotate the slip-on tube to align the silencer with the mounting tabs.
Client Account Details
- Project: Create a Tech Tip for D&D’s New Slip On Exhaust Pipe
- Motorcycle: Designed for H-D FLH Touring Models
- Publication: Bikernet.com
- Writer: Wrench
- Objective: Increase prospect’s knowledge & improve D&D’s recognition
Tighten the mounts to the bag rail first then work forward, and check for clearance between the slip-on and all parts of the motorcycle, including the frame, and the body panels. Then tighten the clamps or bolts. All clamps should be snugged at 6 and 12 o'clock to prevent leaks. Double check for clearance.
D&D slip-ons are designed to maximize your motorcycle's torque and horsepower. No tuning or re-jetting is required. Stock EFI systems will adjust to slight changes and can be altered by a factory tuner, through a computer.
Show and Go Chrome slip-ons can be polished using any quality chrome polish such as Mother's Mag Polish. Rust in rock dings and pits can be polished out. To prevent rust, it's important to keep your slip-on polished and free of road film.
Here's another appearance tip from the D&D gang: You may experience chrome discoloration during the break-in period. It is important to remove it with a good metal polish like “Semi-Chrome” as soon as possible. Keep after it until the chrome is seasoned and the discoloration no longer returns.
Stock air-cleaner and box.
Moving right along we set to replacing the stock air box with the Zippers FlowMax. We first removed the existing air cleaner assembly, including the backing plate and support bracket.
We held onto the stock air cleaner cover for that stealth look. Here's the Max air box description from Zippers:
MaxFlow Air Filters From Zipper’s
Let that puppy breathe! One of the first and easiest ways to improve performance in any engine it to open up the intake. Zipper’s MaxFlow Air Cleaner Upgrade kits include a specially constructed, 100-percent washable and reusable filter element made from multiple layers of surgical-quality cotton gauze that has over 60% more filter area than the factory performance element. This greatly enhances airflow while increasing filter height by only ¾”. Oiled synthetic fiber material traps the smallest dirt particles and provides years and years of service. Special longer mounting hardware is included. Fits H-D Big Twins equipped with factory Stage I air cleaners including 2008 throttle-by-wire bikes.
Simple, affordable and effective upgrade you can feel – installation takes all of about 5 minutes!
Back in the shop, Bob placed the new gasket onto the backing plate, while aligning the holes and mounting studs.
Bob installed the two O-rings into the counterbores in the backing plate where the plate meets the cylinder head. A dab of grease will hold them during installation. Bob placed the plate over throttle body with the gasket in place. He applied low strength thread locker such as blue Loctite to the stanchion studs and loosely attached the backing plate to the throttle body (don't tighten just yet).
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End of Tech Tip Part 1 – Go to D&D 2009 Bagger Slipon Tech Tip – PART 3.
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