SP Concepts Exhaust System for 1999-2005 Harley-Davidson Dyna

SP Concepts Exhaust System for 1999-2005 Harley-Davidson Dyna

SP Concepts is known for these high-and-tight 2-into-1 full exhaust systems developed for Harley-Davidson Dyna motorcycles. Like most 2-into-1 pipes, performance is key. With differently-staged stepped head pipes and different mufflers and cores selected to match the head pipes, SP systems promote exhaust velocity by sweating the details.

• Full stainless steel construction
• TIG-welded
• Header collars are machined of stainless steel
• Hardware kit includes mount bracket, bolts, and speed nuts
• Heat shields for this exhaust are available separately
• Choose your finish
  • Black—satin black high temperature ceramic exhaust coating
  • Stainless—brushed and uncoated; will turn varying shades of gold with exposure to the heat of engine exhaust
• Choose your system type
  • Lane Splitter 
    • 4" rolled cone muffler with 2 1/4" perforated baffle for lots of torque and maximum volume that's often described as the "raspy" pipe in the SP lineup
    • .065" stainless steel head pipes step up from 1 3/4" to 1 7/8" and enter the muffler through a final 2" stepped section
    • A solid choice for unmodified engines or engines with light bolt-on power-adders
    • Shortest exhaust overall length; lots of bark as a result
  • Big Bore
    • 4 1/2" rolled cone muffler with stepped 2 1/4" to 2 1/2" perforated baffle supports the high exhaust flow of large-displacement engines
      
    • Best choice for highly-modified engines
    • Shortest exhaust overall length and loudest exhaust; higher compression ratios and increased displacement will both affect sound
• Choose your header style
  • Standard Stepped
    • .065" stainless steel head pipes step up from 1 3/4" to 1 7/8" and enter the muffler through 2" sections
  • Works Edition
    • The same construction materials and design as the Standard header, but bends are created from pie-cut sections that have been hand-TIG-welded for the competition look

No matter what system you choose, SP pipes also shed weight when you remove your factory exhaust. And of course, the appearance is really a showstopper. People will stop to look at—and hear—your motorcycle. 

This exhaust system does not have oxygen sensor ports. As such, the system is not compatible with motorcycles equipped with either type of OEM fuel injection nor tuning setups (irrespective of induction method) that rely on lambda sensors placed in the exhaust stream. The mounting bracket and hardware are included. Exhaust spring clips are not included; they can be purchased separately.  Exhaust gaskets are not included and should be replaced every time an exhaust system is removed; they also can be purchased separately. Heat shields for SP Concepts exhaust systems are available separately.

When picking an exhaust type, let your modifications be your guide. If you're going to stick mostly with bolt-on engine upgrades to stock engine internals, the Lane Splitter is the correct exhaust systems to select. If you're considering aggressive head work, a radical camshaft, or big increases in bore or stroke, you may want to consider the Big Bore instead. On the fence? Definitely err on the side of a smaller-bore exhaust.