ISR Performance Straight Dual 4" Tip Exhaust - Nissan 240sx 89-94

The ISR Performance Straight Dual 4" Tip Exhaust for the S13 240SX is the original pre-Series II race-style straight-pipe catback. No mufflers, no resonator, just 3" piping splitting straight to dual 4" tips. Built for track use where volume isn't a concern and weight reduction matters.

What It Does

Pure race exhaust: no sound dampening anywhere, full straight-through flow, dual 4" tip outlet. It's loud, it's aggressive, and it's not subtle. This is the original (pre-Series II) ISR design, predating the modular catback family.

Fitment

Designed for the Nissan 240SX 1989-1994 (S13 chassis). This is a pre-Series II exhaust and is not compatible with Series II modular components (mid sections, modular rears). If you want a system you can later modularize with different rear styles, see the Series II catback lineup instead. Limited quantities available.

Product Details

Brand: ISR Performance

Part Number: IS-EPDual-S13BO

Type: Straight-pipe catback exhaust (race)

Vehicle Fitment: Nissan 240SX 1989-1994 (S13)

Piping: 3" straight, splitting to dual 4" tips

Mufflers: None

Resonator: None

Series: Pre-Series II (legacy ISR design, not modular)

Availability: Limited quantities

Series II Alternatives: IS-S2EPSR-S13 (EP Single Resonated), IS-S2GTR-S13/IS-S2GTNR-S13 (GT Single), or any Series II EP Dual catback (S13)

Sold: Complete kit

Legality: Off-road and competition use only