The aFe SATURN 4S 4" Muffler Delete Pipe (MPN 49M00039) is a straight 409 stainless steel tube that replaces the 4-inch in/out muffler found in most factory or performance 4-inch exhaust systems. Its 4" inside diameter, 24" body length, and 30" overall length are the numbers to measure against your existing piping before you order. Swapping a muffler for a plain tube gives you the sharp, unfiltered exhaust note of a 4-inch system without a muffler, and aFe pitches that open path as a way to improve exhaust flow and throttle response.
Compared with a stock muffler, a delete pipe removes the internal chambers that create backpressure. Compared with cheaper thin-wall or mild-steel delete pipes, 409 stainless resists rust and heat discoloration better over years of road salt and track heat cycles. The two included Torca AccuSeal clamps are designed to seal the joint around its full circumference, which matters when a leak at the clamp would undo the sound and flow benefits. Fitment is listed as universal, so the real question for a turbo-back or cat-back owner is whether the exhaust is a 4-inch in/out layout. Owners searching for a 4 inch muffler delete pipe, 409 stainless exhaust delete, or a 4" turbo-back muffler replacement should check diameter and clearance first, and confirm emissions and street-legal status with the manufacturer and local authorities before installing.
The manufacturer states this product does not require a CARB EO#. Details on sales restrictions and street legality vary, so confirm with the manufacturer and check your local regulations before buying.
The manufacturer lists two Torca AccuSeal exhaust clamps as included for a 360-degree sealing surface at each joint.
Per the manufacturer's install sheet for a related aFe delete pipe, aFe recommends professional installation on its products, and the exhaust may need to be cut for custom applications.
Per the manufacturer's install sheet for a related 2.5-inch aFe delete pipe, the general process is: let the exhaust cool, support the vehicle on jack stands, loosen the band clamps on the stock muffler, remove the muffler and the piping behind it, fit the delete pipe into the front section, reinstall the rear piping, align everything, and tighten the clamps. Start the engine and check every joint for leaks, then re-tighten all clamps and bolts after 50 to 100 miles. Plan for a jack, stands, a socket set, and a way to cut the pipe if your layout requires it. Because the manufacturer recommends professional installation, DIY installers should be comfortable working under a hot exhaust and confirming the joints are sealed before driving.
