A 4-inch performance muffler still has a core, and that core is what keeps a straight-piped truck from breathing. Replace the muffler with Diamond Eye 510204, a 27-inch aluminized pipe that sits in the muffler's place.

• Build: Straight-through aluminized pipe, 4-inch inside diameter in and out, 27 inches long, so the 4-inch system stays 4 inches through the old muffler span.
• Part number: Diamond Eye 510204. Muffler replacement pipe, not a muffler.
• Fitment: Universal section for a 4-inch aftermarket exhaust that has room for 27 inches.
• Does not fit: A 5-inch system. The 30-inch aluminized section is 510205, not this pipe.
• Not in the box: The pipe only. No clamps, muffler, or tip.

Order today to secure your replacement and measure the gap the muffler leaves. This pipe is 27 inches, not 30.