Product Weight: 6 lbs. This exhaust replaces the factory rear (axle-back) section, providing increased clearance for off-road use, enhanced exhaust sound, and 10–15 lbs. of weight savings. On the 4Runner, this axle dump exhaust increases volume by approximately 5–10%, giving a slightly deeper tone. Testing shows idle volume increases by about 5 dB, and 7 dB at the top end. The proprietary modular exhaust flange design allows this axle dump exhaust to fit the 4Runner, GX550, and LC250. (The included exhaust flange spacer is for GX550 only.)