ISR Performance Bell Mouth Downpipe - Nissan Skyline R32 GTST R33 GTST

The ISR Performance bell mouth downpipe for the Nissan Skyline R32 GTST and R33 GTST is a full 3 inch stainless steel downpipe built for the RB20DET and RB25DET running stock style turbos. It replaces the restrictive factory downpipe with a one piece bell mouth design that bolts directly to the turbo and lets exhaust gas exit the turbine with far less resistance.

Design and construction

• Stainless steel, full 3 inch one piece construction
• Bell mouth inlet that bolts directly to the turbo
• Replaces the factory downpipe only; it does not replace the catalytic converter

What it does for an RB

The stock downpipe on the GTST chassis is a known choke point behind the turbo. Opening that path up to a full 3 inch improves exhaust flow, which unlocks additional horsepower from the RB25DET or RB20DET, sharpens response, and brings out more of the engine's sound. It is one of the first exhaust mods worth doing on a stock turbo Skyline.

What's included in the box

• 1x bell mouth downpipe
• 1x 5 bolt exhaust gasket
• 1x 2 bolt 3 inch exhaust gasket
• 2x bolts
• 2x nuts

Fitment

Nissan Skyline R32 GTST and R33 GTST with the RB20DET or RB25DET and a stock style turbo. This downpipe is built for the Skyline chassis and is compatible only with right hand drive vehicles. It will not fit left hand drive swapped cars.

Please note

A high flow catalytic converter or test pipe is required to complete the installation, since this downpipe does not take the place of the factory catalytic converter. Pair it with one of those and a matching catback for a complete exhaust path.

All ISR Performance products are designed for off-road use only.