ISR Performance GT Single Exhaust - Nissan R34 25GTT (2 Door)

The ISR Performance GT Single Exhaust is a catback exhaust system for the Nissan Skyline R34 25GTT 2-door (RB25DET-powered Skyline coupe). Mandrel-bent stainless steel with 3-inch piping and a 4.5-inch polished muffler tip, delivering unrestricted flow for serious power builds while retaining a deep and aggressive exhaust tone.

What It Does

Catback replaces the entire exhaust system from the cat back, running 3-inch mandrel-bent piping to a polished muffler with a 4.5-inch tip. Significantly lighter than the factory exhaust and far less restrictive. the right exhaust pairing for any RB25DET build chasing real power, since the factory exhaust becomes a meaningful flow restriction even on mild bolt-on setups.

Critical Fitment

R34 25GTT 2-door (coupe) only. Not compatible with:

• R34 25GTT 4-door (sedan). different exhaust routing
• R34 GT-R (BNR34). uses dual exhaust and different mid-pipe routing
• Any R32 or R33 Skyline. different chassis exhaust layout

Fitment

• Nissan Skyline R34 25GTT 2-door coupe (RB25DET)

What's in the Box

• 1x 3-inch mid-pipe
• 1x 3-inch muffler section with 4.5-inch tip
• 2x 2-bolt 3-inch exhaust gaskets
• 4x Bolts
• 4x Nuts

Product Details

Brand: ISR Performance

Part Number: IS-GT-R34GT

Type: Catback Single Exhaust (GT Series)

Vehicle Fitment: Nissan Skyline R34 25GTT 2-door coupe ONLY

Body Style Restriction: 2-door coupe only (not 4-door sedan)

Model Restriction: 25GTT only (not GT-R / BNR34)

Engine: RB25DET

Material: Mandrel-bent stainless steel

Finish: Brushed stainless

Piping Diameter: 3-inch

Tip Diameter: 4.5-inch, polished

Construction: Precision TIG welded

Installation: Direct bolt-on, gaskets and hardware included

Sold: Complete single exhaust system

Legality: Off-road and competition use only