G-Power BMW Z4 M40i upgrade Delivers 493 HP and 516 Lb-Ft of Torque

The BMW Z4’s retirement has become official with the recently introduced Final Edition, a package focused purely on design touches. However, for fans who wanted more than a cosmetic send-off, G-Power provides the answer. The G-Power BMW Z4 M40i upgrade offers a completely different attitude, pushing the roadster’s output to nearly 500 horsepower and giving the dying nameplate the kind of urgency many wished BMW had delivered from the factory.

This performance package costs approximately $15,000 and focuses purely on mechanical improvements, making the Z4 a potent performer that contrasts sharply with BMW’s subdued farewell model.

G-Power BMW Z4 M40i — Source: G-Power/Instagram

Here is a breakdown of the hardware responsible for the massive power gains.

Hardware First: The 500 HP Formula

G-Power’s philosophy centers on delivering genuine hardware improvements before applying software tuning. The GP-500 software only works when combined with a full stack of components, enabling the engine to safely handle the dramatic increase in boost and torque.

Component	Detail	Performance Impact
Turbocharger	GP-550 Upgrade	Features larger compressor/turbine wheels and CNC-milled housings for higher boost and flow.
Exhaust	GP-DEEPTONE System	Stainless-steel exhaust with quad carbon-fiber tips and dual-flap layout for lower backpressure.
Cooling	Custom Charge-Air Watercooler	Developed via CFD analysis for improved thermal conductivity, essential for managing heat from high boost.
Stock Power	385 hp / 369 lb-ft	N/A
G-Power Output	493 hp / 516 lb-ft	Torque increases by 147 lb-ft over stock.

The Complete Package

The G-Power BMW Z4 M40i upgrade is a comprehensive mechanical package. The turbo and exhaust upgrades allow the engine software to be adapted three-dimensionally, resulting in a stronger torque curve and better overall efficiency under load.

Pricing: The complete G-Power package costs €14,738 (approximately mid-$15,000 USD), excluding installation.
Optional Extras: Buyers can add optional equipment like speed limiter removal and customized burble to the exhaust note.
Interior: G-Power leaves the cabin largely untouched, meaning the roadster keeps its OEM diagnostics and drivability while gaining stronger performance under load.

The G-Power Z4 is the complete opposite of the cosmetic-focused Final Edition. One is a collectible farewell piece, while the other is a compelling argument for why the Z4—now with supercar-rivalling power—didn’t need to bow out quietly.

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