aFe MACH Force-Xp 2.5-Inch Cat-Back Exhaust — Lexus GX470

409 stainless cat-back with a polished oval tip

The aFe 49-46016-P MACH Force-Xp cat-back uses 2.5-inch mandrel-bent 409 stainless tubing, a straight-through muffler and a polished 304 stainless outlet tip. Factory-style flange and bayonet hangers retain the original mounting arrangement. The exact manufacturer page and installation guide name 2005–2009 GX470 V8 4.7L; the broader secondary-listed 2003–2004 scope needs separate confirmation.

Key Features

• Selected aFe part 49-46016-P.
• 2.5-inch mandrel-bent 409 stainless exhaust tubing.
• Straight-through muffler and single polished 304 stainless outlet tip.
• Factory-style flange, OE-style bayonet hangers and two different-size band-clamp connections.
• Factory isolation mounts, flange spring bolts and other retained factory hardware are reused.
• Manufacturer reports 9 hp and 14 lb-ft gains; a selected test chart and test conditions are not established here.
• Manufacturer describes an aggressive sound; no measured sound level or drone-free result is established.

Fitment

The current exact manufacturer page and March 2014 guide specify 2005–2009 Lexus GX470 V8 4.7L, with the guide naming a 109.8-inch wheelbase. WheelFlip lists GX470 Base 2003–2009 in its complete fitment table while its description also says 2005–2009. The original Base 2003–2009 scope remains, but 2003–2004 is explicitly unverified against the manufacturer scope. Obtain aFe confirmation before ordering for those earlier years; no physical incompatibility is inferred from the narrower listing.

Specifications

What's Included

• The 49-46016-P kit includes one mid-pipe 05-44863, one muffler assembly 05-44864 and one one-piece over-axle/tailpipe 05-44865, with the selected polished outlet.
• One diagrammed 3-inch band clamp 05-41055 and one 2.5-inch band clamp 05-41061.
• Reuse original hardware, isolation mounts and flange spring bolts. No intake filter, silicone coupling, catalytic converter or oxygen sensor is established as supplied.

About aFe Power

aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.

Related Parts

• Exact current manufacturer construction and application
• Selected seven-step manufacturer installation guide and component diagram
• Complete exact named secondary fitment table
• Shop cat-back exhaust systems
• Shop aFe Power

FAQ

It is the selected 2.5-inch 409 stainless MACH Force-Xp cat-back with a polished 304 stainless tip for the documented GX470 V8 4.7L application.

No. The secondary table lists Base 2003–2009, but the exact current manufacturer page and selected guide name 2005–2009. The earlier legacy scope is retained as unverified; obtain aFe confirmation before ordering.

The system has one rear outlet with a single polished oval tip. The guide identifies the one-piece over-axle/tailpipe assembly rather than a separate replacement-tip part number.

The selected guide places the 3-inch band at the mid-pipe-to-muffler connection and the 2.5-inch band at the muffler-to-over-axle/tailpipe connection. Do not substitute one generic size at both joints.

Retain the factory hardware and isolation mounts. The mid-pipe installs with the original flange spring bolts and isolation mounts. A newly supplied flange gasket is not identified in the diagram.

No cutting, welding, oxygen-sensor transfer or battery procedure is specified in the selected seven-step guide. It directs removal of the original exhaust up to the catalytic converter from rear to front.

No numerical torque is printed. Keep clamps loose until assembled, align, then tighten flange bolts and clamps front to rear. Re-tighten all exhaust components after 50–100 miles. Maintain the guide’s stated tailpipe clearance of at least 1/2–1 inch from body panels.

No. The manufacturer reports 9 hp and 14 lb-ft gains and describes an aggressive sound, but a selected chart, test conditions, measured decibels and drone result are not established. Results depend on the vehicle and its complete exhaust.

Installation Instructions

1. Confirm aFe 49-46016-P against the exact vehicle and installed equipment. Inventory the actual components and follow the selected manufacturer instructions and current vehicle service requirements.
2. Read the complete selected guide and resolve any 2003–2004 application question with aFe before work. Let the exhaust cool, wear eye and hand protection and use professional installation with the vehicle and exhaust safely supported.
3. Remove the original exhaust up to the catalytic converter, working from rear to front. Retain the original factory hardware and isolation mounts. Lay out the new pieces in the diagrammed order.
4. Install the mid-pipe with the original isolation mounts and flange spring bolts. Leave it loose. Join the muffler assembly to the mid-pipe with the supplied 3-inch band clamp.
5. Install the one-piece over-axle/tailpipe onto the muffler assembly with the 2.5-inch band clamp. Keep the connections loose until the whole system is assembled and aligned.
6. Position the exhaust with the guide’s stated tailpipe clearance of at least 1/2–1 inch from body panels. Tighten flange bolts and clamps from front to rear; no numerical torque is established by this guide. Re-tighten all exhaust components after 50–100 miles.

California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.