Next Level Performance
July 26, 2026 • 11 min read
Our Verdict
For a stock-block Nissan 350Z, the HKS GT S/C supercharger is the single biggest power upgrade you can bolt on — a complete kit that adds well over 150 wheel horsepower on pump gas.
Not chasing max power? A Borla True Dual cat-back and an Injen cold air intake are the best-value first mods, Ohlins Road & Track coilovers transform the chassis, and a Mishimoto aluminum radiator is the cheapest insurance the heat-prone VQ35 engine can get. Below are the seven upgrades we fit most often in our Tampa, FL shop.
Shop Our Top Pick →The Nissan 350Z (Z33) remains one of the best-value rear-wheel-drive performance platforms you can build, and the right Nissan 350Z performance upgrades unlock big gains without touching the bulletproof VQ35 bottom end. Built from 2003 to 2008, the 350Z paired a 3.5L V6 with a near 50/50 weight balance, a 6-speed manual, and a proper limited-slip differential — a genuine sports car for used-Miata money. From the factory the VQ35DE made 287 horsepower (2003-2004), climbed to 300 hp with the "Rev-Up" motor (2005-2006), and finished with the 306 hp, 7,500 rpm VQ35HR in 2007-2008. This guide rounds up the seven upgrades — power, exhaust, intake, suspension, brakes, cooling, and weight reduction — that deliver the most measurable improvement per dollar.
Why the 350Z (Z33) Is Still a Tuner Favorite
The 350Z is a tuner favorite because it combines a rev-happy naturally aspirated V6, rear-wheel drive, and a huge, cheap aftermarket. The VQ35 responds hard to bolt-ons, the FM (Front Midship) chassis it shares with the Infiniti G35 has near-perfect balance, and nearly every wear item is inexpensive two decades on. A 3,200-3,400 lb curb weight and a factory viscous or clutch-type LSD mean the car rewards suspension and brake work as much as power. The result: you can build a 350Z into a 400+ wheel-horsepower street car or a track-day weapon on a used-car budget, and every part in this guide is a proven, in-stock upgrade for the 2003-2008 Z33.
Best 350Z Power Upgrade: HKS GT Supercharger
The most horsepower you can add to a stock 350Z is forced induction, and the HKS GT S/C System Pro is the most complete supercharger kit for the VQ35DE. It is a centrifugal blower kit that HKS advertises pushing gains north of 150 wheel horsepower on low boost and pump gas — enough to take a 287 hp 2003-2004 car past 400 crank horsepower while keeping the factory driveability. The Pro kit ships with the supercharger, an air-to-air intercooler, upgraded fuel injectors, and HKS engine management, so it is a true bolt-and-tune package rather than a parts collection. At $5,900 it is the priciest single upgrade here, but nothing else even comes close on power-per-install.
Key Specifications — HKS GT S/C
What We Like
- + Biggest power gain of any bolt-on — 150+ wheel horsepower
- + Complete kit: intercooler, injectors, and engine management included
- + Linear, factory-smooth power delivery on the reliable VQ35 block
Things to Consider
- – Highest up-front cost of any upgrade in this guide
- – Supporting clutch and fuel upgrades recommended before adding boost
Best 350Z Exhaust: Borla True Dual Cat-Back
The best-sounding, best-built exhaust for the 350Z is the Borla True Dual cat-back. Fabricated from aircraft-grade T-304 stainless steel with a true dual layout and dual rear exit, it typically frees up 10-15 horsepower on a naturally aspirated VQ35 while cutting weight over the restrictive factory system. Borla’s patented straight-through, mandrel-bent design gives the Z its signature deep V6 growl without droning on the highway, and it is backed by Borla’s legendary million-mile warranty. At $1,888.99 it is a premium system, but it is the last cat-back you will ever buy.
Borla’s true dual, mandrel-bent T-304 layout gives the VQ35 its signature growl.
Best 350Z Cold Air Intake: Injen SP Series
The best value power mod for any 350Z is a cold air intake, and the Injen SP Series is the proven pick. Injen’s mandrel-bent aluminum tube and patented MR Technology (a machined air diverter) are dyno-tuned to add roughly 13-18 horsepower and sharpen throttle response on the VQ35DE, all for under $500. It is a genuine bolt-on — most owners install it in under an hour with hand tools — and the polished or black finish looks the part under the hood. Paired with the Borla exhaust and a reflash, it is the classic first stage of any 350Z build.
Best 350Z Suspension: Ohlins Coilovers & Sway Bars
The single upgrade that most transforms how a 350Z drives is a quality coilover, and the Ohlins Road & Track system is the benchmark. Built around Ohlins’ motorsport-derived DFV (Dual Flow Valve) monotube dampers, it offers 36 clicks of adjustable damping so you can dial in a compliant street ride or track-ready control on the same set. It corrects the Z’s factory nose-heavy body roll and drops the center of gravity while retaining daily usability. At $2,800 it is an investment, but Ohlins quality and rebuildability make it a lifetime part. Add an ST adjustable anti-sway bar set to flatten cornering and tune understeer or oversteer to taste.
An ST adjustable sway bar set flattens body roll and lets you tune the 350Z chassis balance.
Best 350Z Big Brake Kit: Wilwood Superlite 6R
If you add power or hit the track, upgrade the brakes — the Wilwood Narrow Superlite 6R front kit is our pick for the 350Z. It replaces the factory single-piston caliper with a forged-aluminum, 6-piston Superlite caliper clamping a 14.00-inch two-piece rotor, dramatically increasing thermal capacity and killing the brake fade that plagues a stock, boosted, or tracked Z. The two-piece rotor design also sheds unsprung weight versus the OEM cast setup. Available in multiple rotor sizes and caliper finishes (including red), it is a bolt-on stage that transforms braking confidence for $2,330.34.
Cooling & Weight: Mishimoto Radiator + Seibon Carbon Hood
The VQ35 runs hot in the 350Z’s tight engine bay, and heat soak is the number-one enemy of consistent power — especially on tracked or forced-induction cars. A Mishimoto full-aluminum radiator uses a larger, TIG-welded aluminum core to drop coolant temperatures by roughly 15-30°F versus the aging plastic-tank OEM unit, and at $349.95 it is the cheapest reliability upgrade on this list. To take the reduction further, a Seibon VT carbon fiber hood cuts real weight over the front axle — genuine 2x2 twill carbon is far lighter than the factory steel hood — and its vents help extract underhood heat while sharpening the Z’s aggressive look.
A Seibon carbon hood trims weight over the front axle and vents underhood heat.
350Z Performance Upgrades Compared
| Upgrade | Category | Key Benefit | Price |
|---|---|---|---|
| HKS GT S/C System ProTop Pick | Supercharger | 150+ whp on pump gas | $5,900.00 |
| Ohlins Road & Track Coilovers | Suspension | 36-way damping, DFV monotube | $2,800.00 |
| Wilwood Superlite 6R BBK | Big Brake Kit | 6-piston, 14in 2-pc rotor | $2,330.34 |
| Borla True Dual Cat-Back | Exhaust | T-304 dual, 10-15 hp | $1,888.99 |
| Seibon VT Carbon Hood | Weight / Aero | Carbon fiber, vented | $1,350.00 |
| ST Anti-Swaybar Set | Handling | Adjustable front + rear | $649.00 |
| Injen SP Cold Air Intake | Intake | Best value, 13-18 hp | $480.67 |
Frequently Asked Questions
What is the best 350Z performance upgrade for more horsepower?
The HKS GT S/C System Pro supercharger is the best 350Z power upgrade, adding more than 150 wheel horsepower on pump gas. It is a complete centrifugal kit with an intercooler, upgraded injectors, and engine management, taking a stock 287-306 hp VQ35 well past 400 crank horsepower while keeping factory driveability.
How much horsepower does a Nissan 350Z make?
The Nissan 350Z's 3.5L VQ35 V6 made 287 horsepower in 2003-2004, 300 horsepower with the 2005-2006 Rev-Up engine, and 306 horsepower with the VQ35HR in 2007-2008. All years are rear-wheel drive and rev to between 6,600 and 7,500 rpm depending on the engine version.
What is the best exhaust for a 350Z?
The Borla True Dual cat-back is the best exhaust for the 350Z. It is built from T-304 stainless steel with a true dual, mandrel-bent design, frees up roughly 10-15 horsepower, delivers a deep V6 growl without highway drone, and carries Borla's million-mile warranty.
Are coilovers worth it on a 350Z?
Yes. Coilovers are the single biggest handling upgrade for a 350Z. The Ohlins Road & Track system uses 36-way adjustable DFV monotube dampers to cut body roll, lower the car, and let you switch between a comfortable street setup and track-ready control on the same hardware.
Why does the Nissan 350Z run hot?
The 350Z runs hot because the VQ35 V6 sits in a tight engine bay and the OEM plastic-tank radiator degrades with age, causing heat soak. A Mishimoto full-aluminum radiator uses a larger TIG-welded core to lower coolant temperatures by about 15-30 degrees F, which is critical for tracked or supercharged cars.
What mods should I do to my 350Z first?
Start with a cold air intake and a cat-back exhaust for the best value power and sound, then add coilovers and sway bars for handling. Upgrade the radiator for reliability, and only add a supercharger and big brake kit once the supporting clutch, fuel, and cooling systems are ready for the extra power.
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