ISR Performance Downpipe - Nissan SR20DET S13/S14

The ISR Performance Downpipe is a 3-inch stainless steel downpipe for the Nissan SR20DET in both S13 and S14 chassis. Direct replacement for the restrictive factory downpipe, with TIG-welded construction, machined flanges, and all gaskets and hardware needed for install. The downpipe is the single biggest exhaust flow restriction on a stock or mildly upgraded SR20DET. opening it up is one of the most felt bolt-on changes you can make.

What It Does

The factory SR20DET downpipe is narrow, restrictive, and a known choke point even on stock turbos. Stepping up to a 3-inch downpipe drops backpressure at the turbine outlet, helps the turbo spool more efficiently, and lets the rest of the exhaust system actually do its job. Pairs well with a 3-inch O2 housing (or skip the O2 housing entirely on race-only builds) and a 3-inch catback.

Fitment

• 1989-1994 Nissan 240SX (S13) with SR20DET swap
• 1995-1998 Nissan 240SX (S14) with SR20DET (factory or swapped)

Installation Note

Most installs are direct bolt-on, but depending on your specific exhaust setup, headers, or turbo, minor customization (clearancing or alignment work) may be needed in some cases. Most builds will not require any modification.

What's in the Box

• 1x ISR Performance 3-inch stainless steel downpipe
• 1x 3-bolt gasket
• 1x 2-bolt gasket
• 5x Nuts
• 5x Bolts

Product Details

Brand: ISR Performance

Part Number: IS-SSDP-NS13

Type: Turbo Downpipe

Vehicle Fitment: 1989-1998 Nissan 240SX (S13 and S14) with SR20DET

Engine Compatibility: Nissan SR20DET

Diameter: 3 inch (full length)

Material: Stainless steel

Construction: TIG welded, machined flanges

Replaces: Factory restrictive downpipe

Installation: Direct bolt-on (minor clearancing may be needed in rare cases)

Sold: Individually with gaskets and hardware

Legality: Off-road and competition use only