Econo baffles for Lake Headers. This kit is available to fit all 3.5” and 4” lake header megaphones. These units have flanges that bolt to your existing collector flange for an easy installation. Choose for either a 3 bolt triangular flange or a round 4 bolt flange. Each kit comes with a hi-performance packing capable of extreme exhaust temps, and the baffles are easily re-packed. You do have the option of drilling holes in the end disk for a louder tone as well as for more flow. These baffles will flow fine on most street applications. Beats the alternative of expensive full exhaust systems. Fit ALL manufacturer lake headers. Requires welding. SOLD AS A PAIR.