ISR Performance Series II - MBSE Rear Section Only - BMW E46

The ISR Performance Series II MBSE Rear Section is the standalone rear axle-back component of the Series II modular exhaust platform for the BMW E46. Sold separately so Series II exhaust owners can swap rear configurations without replacing the entire system.

What It Does

This is the REAR AXLE-BACK SECTION ONLY, not a complete exhaust system. The Series II modular architecture lets you mix and match mid and rear sections, so an owner who started with a Series II EP Dual rear can swap to this MBSE rear section for a more refined dual tip configuration without buying a whole new exhaust system.

Critical Compatibility

ONLY works with ISR Series II exhaust systems. This section will NOT bolt up to the factory OEM E46 exhaust or to the original (pre-Series II) ISR exhausts. Confirm you already have a Series II mid section installed before ordering this rear-only piece.

This Is Not a Complete Exhaust

You need a Series II mid section to use this part. If you're starting fresh and want a complete catback in the MBSE configuration, order the Series II MBSE Resonated Catback instead (early 323/328 or late 325/330 header style, depending on your car).

Fitment

• BMW E46 with an ISR Series II mid section already installed

Compatible with either the Early (323/328) or Late (325/330) Series II mid sections, since the early/late distinction is on the header side of the system, not the rear side.

What's in the Box

• 1x MBSE rear axle back section
• 1x Gasket and hardware pack
• 2x Metal conversion hangers
• 2x Hanger bushings

Product Details

Brand: ISR Performance

Part Number: IS-S2RO-MBSE-E46

Type: Series II MBSE Rear Section (axle-back only)

Vehicle Fitment: BMW E46 with Series II mid section installed

Configuration: Dual 2.5 inch tip muffler section, extended tip

Compatibility: ISR Series II exhaust systems ONLY - not OEM or original ISR exhausts

Architecture: Series II modular (interchanges with EP Dual rear section)

Required to Complete System: Series II resonated or non-resonated mid section (sold separately)

Sold: Rear section only

Legality: Off-road and competition use only