One of One - Custom Auto

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One of One - Custom Auto Helping you unlock the true potential of your car with custom-built exhaust systems, in-house performance mods & regular servicing.

Your go-to specialist for anything Mazdaspeed.

22/01/2026

This manifold wasn’t just built to look good, that was a by-product. 💅🏻

It was designed for faster boost, better fit, and a setup you can’t buy off the shelf on a Mazdaspeed.

Built for one car and with intent.

DM us if you’re planning a serious build 📲

18/12/2025

Clean upgrades on this Mazdaspeed6🔥scott

Fresh pipes for this ‘92 Nissan Laurel 🔥 Smooth flow, crisp sound.Swipe 👉🏻 and turn up the volume.
15/10/2025

Fresh pipes for this ‘92 Nissan Laurel 🔥
Smooth flow, crisp sound.
Swipe 👉🏻 and turn up the volume.

From Stock to Street-Ready.This Mazdaspeed3 rolled in bone stock. Now it’s breathing, sounding, and pulling like it shou...
09/07/2025

From Stock to Street-Ready.
This Mazdaspeed3 rolled in bone stock. Now it’s breathing, sounding, and pulling like it should.
We equipped it with a full 4" aluminum air intake, paired with a high pressure fuel pump upgrade kit to safely support more airflow and fuel delivery.
One step colder plugs (LTR7IX-11) went in for more reliable spark under increased boost, while the Damond rear motor mount stiffened up the drivetrain response - goodbye slop, hello sharper shifts.
Out back, our custom-built 3" stainless steel cat-back exhaust, featuring an AdrenalinR mid-muffler and shotgun tips, gave it the bark to match the bite—aggressive tone, clean welds, zero drone.
Cooling? Sorted. We built and installed a full front mount intercooler set-up using a Treadstone core and custom fabricated piping to keep intake temps in check under spirited driving.
This setup is clean, functional, and fully done in-house.
If you’re driving a Mazdaspeed and still stock or lightly modded—this is your sign. These upgrades don’t just wake the car up, they transform the entire driving experience.

📍Ready to upgrade your Speed? Send us a message or drop by the shop. We’ll build it right, just like we did this one.

🏎 Pickering

Ever wondered what a K04 turbo inhaling through a 4” intake sounds like? Swipe 👉🏻for pure, unfiltered turbo noises strai...
12/03/2025

Ever wondered what a K04 turbo inhaling through a 4” intake sounds like? Swipe 👉🏻for pure, unfiltered turbo noises straight from the source 🐌🎵

Our custom 4” aluminum intake with BOV is designed for max airflow and faster boost recovery on every shift. 🌬️

DM us to get yours and let your car breathe freely like it should!

Aariz’s Gen1 [LWKY8U] came in for a full performance transformation, and we delivered! Here’s a breakdown of the upgrade...
05/03/2025

Aariz’s Gen1 [LWKY8U] came in for a full performance transformation, and we delivered! Here’s a breakdown of the upgrades that took this build to the next level:⁣
⁣
🔹𝐓𝐔𝐑𝐁𝐎 & 𝐄𝐗𝐇𝐀𝐔𝐒𝐓 𝐔𝐏𝐆𝐑𝐀𝐃𝐄𝐒⁣
• 𝐒𝐜𝐚𝐥𝐞𝐬 𝐒𝐧𝐚𝐢𝐥𝐬 𝐆𝐓𝐗𝟐𝟗𝟔𝟕𝐫 𝐭𝐮𝐫𝐛𝐨 – faster spool, more power⁣
• 𝐂𝐮𝐬𝐭𝐨𝐦 𝐭𝐮𝐫𝐛𝐨-𝐛𝐚𝐜𝐤 𝐞𝐱𝐡𝐚𝐮𝐬𝐭 – improved flow & aggressive sound⁣
• 𝐗𝐒 𝐏𝐨𝐰𝐞𝐫 𝐞𝐱𝐡𝐚𝐮𝐬𝐭 𝐦𝐚𝐧𝐢𝐟𝐨𝐥𝐝 – better boost response⁣
⁣
🔹𝐈𝐍𝐓𝐀𝐊𝐄 & 𝐅𝐔𝐄𝐋𝐈𝐍𝐆 𝐄𝐍𝐇𝐀𝐍𝐂𝐄𝐌𝐄𝐍𝐓𝐒⁣
• 𝐂𝐮𝐬𝐭𝐨𝐦 𝟒” 𝐢𝐧𝐭𝐚𝐤𝐞 – maximized airflow for the turbo⁣
• 𝐂𝐨𝐫𝐤𝐒𝐩𝐨𝐫𝐭 𝐢𝐧𝐭𝐚𝐤𝐞 𝐦𝐚𝐧𝐢𝐟𝐨𝐥𝐝 & 𝐭𝐡𝐫𝐨𝐭𝐭𝐥𝐞 𝐛𝐨𝐝𝐲 – optimized airflow for power gains⁣
• 𝐇𝐏𝐅𝐏 𝐮𝐩𝐠𝐫𝐚𝐝𝐞 – essential for fueling under high boost⁣
• 𝐂𝐥𝐞𝐚𝐧𝐞𝐝 𝐢𝐧𝐣𝐞𝐜𝐭𝐨𝐫𝐬 + 𝐎𝐯𝐞𝐫𝐬𝐩𝐞𝐞𝐝 𝐌𝐨𝐭𝐨𝐫𝐬𝐩𝐨𝐫𝐭𝐬 𝐢𝐧𝐣𝐞𝐜𝐭𝐨𝐫 𝐬𝐞𝐚𝐥𝐬⁣
⁣
🔹𝐂𝐎𝐎𝐋𝐈𝐍𝐆 & 𝐁𝐎𝐎𝐒𝐓 𝐂𝐎𝐍𝐓𝐑𝐎𝐋⁣
• 𝐂𝐮𝐬𝐭𝐨𝐦 𝐅𝐌𝐈𝐂 𝐩𝐢𝐩𝐢𝐧𝐠 + 𝐓𝐫𝐞𝐚𝐝𝐬𝐭𝐨𝐧𝐞 𝐓𝐑𝟖 𝐜𝐨𝐫𝐞 – lower intake temps = denser air = more power⁣
• 𝟑-𝐩𝐨𝐫𝐭 𝐄𝐁𝐂 – fine-tuned boost control for better response⁣
• 𝐆𝐅𝐁 𝐄𝐗𝟒𝟒 𝐞𝐱𝐭𝐞𝐫𝐧𝐚𝐥 𝐰𝐚𝐬𝐭𝐞𝐠𝐚𝐭𝐞 – helps control boost pressure⁣
⁣
🔹𝐄𝐍𝐆𝐈𝐍𝐄 & 𝐃𝐑𝐈𝐕𝐄𝐓𝐑𝐀𝐈𝐍 𝐑𝐄𝐈𝐍𝐅𝐎𝐑𝐂𝐄𝐌𝐄𝐍𝐓𝐒⁣
• 𝐃𝐚𝐦𝐨𝐧𝐝 𝐌𝐨𝐭𝐨𝐫𝐬𝐩𝐨𝐫𝐭𝐬 𝐫𝐞𝐚𝐫 & 𝐝𝐫𝐢𝐯𝐞𝐫-𝐬𝐢𝐝𝐞 𝐦𝐨𝐮𝐧𝐭𝐬 – reduced engine movement and improves shifting and feel⁣
• 𝐃𝐚𝐦𝐨𝐧𝐝 𝐌𝐨𝐭𝐨𝐫𝐬𝐩𝐨𝐫𝐭𝐬 𝐄𝐆𝐑 𝐝𝐞𝐥𝐞𝐭𝐞 – cleaner, more efficient engine operation⁣
• 𝐓𝐢𝐦𝐢𝐧𝐠 𝐜𝐡𝐚𝐢𝐧 𝐤𝐢𝐭 & 𝐟𝐫𝐞𝐬𝐡 𝐬𝐩𝐚𝐫𝐤 𝐩𝐥𝐮𝐠𝐬 – crucial for long-term reliability⁣
• 𝐖𝐎𝐓𝐛𝐨𝐱 – improved shifting & launch control⁣
⁣
Everything was installed and custom-built in-house to ensure top-tier quality and performance. Then tying these all up with a custom methanol tune from Cyborg Performance
⁣
If you’re looking to upgrade, service, or maintain your Mazdaspeed, we’ve got the experience to make it happen. DM us to get started!⁣
⁣
⁣

Merry Christmas and a Happy New Year ! Just a quick reminder that we are currently closed and will be back on the 6th of...
27/12/2024

Merry Christmas and a Happy New Year ! Just a quick reminder that we are currently closed and will be back on the 6th of January.

We appreciate all your support throughout this year and can’t wait to do it again in 2025. Til then, we hope you have a festive, restful and fun holiday break!

We’re still contactable for any questions or queries via social media and email, and are taking bookings for next year.

Stay safe and have a good one! 🎄🎉

New to Mazdaspeed and looking to get started with mods? Here’s a rundown of the first power mods you should consider:Upg...
25/09/2024

New to Mazdaspeed and looking to get started with mods? Here’s a rundown of the first power mods you should consider:

Upgraded Fuel Pump Internals
Mazdaspeed engines are notorious for having high-pressure fuel pump (HPFP) limitations, especially when you start adding power. Upgrading the fuel pump internals is a must if you’re tuning your car. This upgrade ensures your engine gets the fuel it needs, especially at higher RPMs.

3.5” Air Intake
A cold air intake is one of the most popular mods for good reason. It improves airflow, giving you a noticeable bump in throttle response and power. Plus, it adds that sweet spooly sound! Go custom to ensure quality fitment and gains.

Upgraded Intercooler
The stock intercooler does a decent job, but once you start pushing for more power, heat becomes an issue. A front-mount intercooler will help keep those intake temperatures down, ensuring your engine breathes cooler, denser air. This is crucial for maintaining performance, especially during hot summer drives or track days.

Downpipe and Exhaust
Opening up the exhaust is one of the best ways to free up some extra power. A high-flow downpipe reduces backpressure, allowing the turbo to spool quicker and making your Mazdaspeed feel more responsive. Pair it with a cat-back exhaust for an aggressive sound that matches the new performance.

Rear Motor Mount
The stock mount is known to be a weak spot, causing excessive engine movement, wheel hop, and sloppy shifts. Swapping it out for an upgraded mount improves power delivery, reduces vibrations, and tightens up the overall driving feel. Plus, it’s a relatively easy install.

One Step Colder Spark Plugs
It’s a simple and affordable upgrade that helps avoid pre-ignition, and supports higher boost levels. Perfect for anyone planning to add more power down the line.
*The plugs will need to be gapped to avoid misfire.

ECU Tuning
If there’s one mod that can transform your Mazdaspeed, it’s a proper tune. Tuning is required for a larger intake and a downpipe. While you may not necessarily need a tune after adding parts, it’s important to remember these 2 things: when you’re modifying a car that changes the amount of air going into or leaving the engine; or altering any aspect of the fuel system, then you will need a tune.

The best part about modding your Mazdaspeed is that each upgrade makes the car feel more personal and exciting to drive. Start with these foundational mods, and you’ll be well on your way to turning your Mazdaspeed into the most enjoyable version of itself. Remember, each mod works best when paired with the right tune, so take your time, enjoy the process, and make sure you’re getting the most out of every upgrade.

25/09/2024

Still time left to score yourself 15% off all GFB products!
Offer ends midnight 30th September.

Zyan’s Speed6 has been a long project but left the workshop with heaps of performance upgrades including some custom fab...
04/09/2024

Zyan’s Speed6 has been a long project but left the workshop with heaps of performance upgrades including some custom fabrication work. We started off with a full checkover to make sure we tackle any potential problems before they become serious, then went on with the following list 👇🏽

CUSTOM FABRICATION:
🟤 Exhaust Manifold
🟤 Donwpipe
🟤 4” Air Intake
🟤 Wastegate Screamer Pipe
🟤 Battery Bracket

EXISTING PARTS MOD:
🟤 I/C Piping for new turbo placement
🟤 Race pipe section
🟤 BOV blanking plug
🟤 Battery tray to suit smaller battery

PARTS:
🟤 3-Port EBC
🟤 Heat Shield
🟤 Clutch Master Cylinder
🟤 Drive Belt
🟤 One-step Colder Spark Plugs
🟤Turbo & Coolant Lines

🏎️ .2xtra

16/07/2024

Hear the sound of these cars come to life with just an axle~back exhaust, all custom-made and installed.

DM us if you want some noise 📢

Adding a bit of rumble to this BMW with a custom axle~back exhaust ♠️Wanting to make your car sound aggressive or achiev...
12/06/2024

Adding a bit of rumble to this BMW with a custom axle~back exhaust ♠️

Wanting to make your car sound aggressive or achieve a particular tone? Let’s have a chat and we can make it happen.

Address

62A Hillside Road, Glenfield
Auckland
0627

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 6pm
Thursday 9am - 6pm
Friday 9am - 6pm

Telephone

+6494413101

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