What size is the MKNI0069?

It's a 2.5in cat-back — the tighter-bore option, which keeps gas speed up for low and mid-range response on a mostly-stock engine.

Yes. It runs two mufflers in series, both absorbing sound, so it's the quiet end of the range for the GU.

Does it keep the catalytic converter?

Yes. It's a cat-back, so it replaces the exhaust from behind the cat and leaves the factory catalytic converter in place.

MKNI0069

Nissan Patrol GU 4.5L 2.5in Cat Back Exhaust System Muffler & Muffler

Nissan Patrol GU 4.5L 2.5in Cat Back Exhaust System Muffler & Muffler.

BrandMantaMPI Automotive

Category: Mufflers and resonators

RRP $893.24 AUD

In stock at supplier

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Nissan Patrol GU 4.5L 2.5in Cat Back Exhaust System Muffler & Muffler product image

Part specs

SKU: MKNI0069
Supplier: MPI Automotive
Category: Mufflers and resonators
Vehicle fitment: Nissan
Stock status: In stock at supplier

At 2.5in, the MPI Automotive MKNI0069 is the tighter-bore cat-back for the Nissan Patrol GU 4.5L — a system sized to keep gas speed up rather than chase maximum volume, and one that runs two mufflers for a quiet note. The 2.5in pipe and twin-muffler tune are what set it apart.

What does a 2.5in bore suit here?

A 2.5in cat-back keeps the pipe smaller than the big-bore options, which keeps exhaust gas speed up — generally the friendlier choice for low-down and mid-range response on a mostly-stock or lightly-modified engine, rather than a heavily built one. On the GU 4.5L that makes the MKNI0069 a sensible, well-matched upgrade over the factory system without over-sizing the pipe. Paired with two mufflers it stays quiet, so it's the modest, civilised cat-back rather than a loud one.

Why two mufflers?

Each muffler absorbs sound, so running a pair in series keeps the note firmly in check — this is the quiet end of the range. There's no hotdog or open section to add voice; the 2.5in bore and the twin silencers together prioritise a refined, drone-free result.

Is the MKNI0069 road legal?

This is a cat-back, meaning it replaces the exhaust from behind the catalytic converter back — so it leaves the Patrol's factory cat and emissions hardware untouched, the usual compliance sticking point. That makes it registration-friendly, though final compliance depends on your specific build and state requirements, so confirm those with the workshop before fitting.

Will it fit my GU 4.5L, and how do you fit it?

It's listed to fit the Nissan Patrol GU 4.5L in 2.5in with two mufflers. The supplier doesn't publish a year range, so confirm your exact GU build with the workshop first. Oak Flats Muffler Men supplies and fits this MPI Automotive cat-back in the Illawarra — we'll check the 2.5in routing and both muffler clearances under your Patrol and book the bay once it's confirmed.

Stocked and fitted by Oak Flats Muffler Men, the Illawarra exhaust and 4x4 specialist in Oak Flats, NSW.

Common questions

What size is the MKNI0069?: It's a 2.5in cat-back — the tighter-bore option, which keeps gas speed up for low and mid-range response on a mostly-stock engine.
Is it quiet?: Yes. It runs two mufflers in series, both absorbing sound, so it's the quiet end of the range for the GU.
Does it keep the catalytic converter?: Yes. It's a cat-back, so it replaces the exhaust from behind the cat and leaves the factory catalytic converter in place.

Fitment support across the Illawarra

Fitment checks near you across 18 Illawarra suburbs, from Oak Flats and Shellharbour to Wollongong and Kiama.Show nearby fitment areasCollapse section

Oak Flats Muffler Men can check this part against supplier specs, part number, image, RRP and vehicle details for customers around Oak Flats, Shellharbour, Wollongong, Dapto, Albion Park, Kiama and the northern suburbs.

Book the right exhaust job without guessing.

Send the vehicle make, model, year, engine, current issue, desired sound or performance goal, and clear photos of the existing exhaust where available.

Unit 2/8 Shaban St, Albion Park Rail NSW 2527 02 4256 3740 sales@mufflermen.com.au Send vehicle details