AC Schnitzer ACS4 Package for BMW Z4 M40i G29 | 400 bhp B58 Tuning Upgrade | Quad Exhaust with Carbon Tips | 20 Inch Alloys | Lowering Springs & Aero Body Kit | UK Fitted | OPF Compatible | Warranty Backed

AC Schnitzer ACS4 Package for BMW Z4 M40i G29

Take your BMW Z4 M40i G29 to a higher level with the AC Schnitzer ACS4 package. This carefully engineered upgrade delivers a genuine 400 bhp power increase, a deeper, richer soundtrack from a quad outlet sports exhaust with carbon fibre tips, stunning 20 inch AC Schnitzer alloys, lower ride height for sharper turn-in and confidence, and a full aero enhancement for a purposeful, OEM-plus finish. We have fitted this complete kit to customer cars and our own builds, and the feedback on performance, road manners and quality has been outstanding.

If you are searching for BMW Z4 M40i performance parts UK, G29 power upgrade, B58 tuning for Z4, four tailpipe exhaust for Z4 M40i, carbon tailpipes Z4, Z4 G29 body styling, Z4 20 inch alloys, or Z4 ride height drop with springs, this ACS4 conversion is the benchmark.

What You Get in the ACS4 Conversion

• 400 bhp engine upgrade with 3 year engine, drivetrain and OPF warranty*
• 20 inch AC1 alloy wheels in bi-colour or anthracite, 8.5J front and 10J rear
• RDC valves fitted and compatible with TPMS systems
• Michelin Pilot Sport 4S tyres 255/30/20 front and 275/30/20 rear
• Lowering spring set for reduced ride height and improved handling response
• Front splitter with mounts painted either colour coded or gloss black
• Side skirt set for a more aggressive side profile
• Rear spoiler elements finished colour coded or gloss black
• Quad sports exhaust with carbon fibre tailpipes
• Alloy pedal set and footrest
• AC Schnitzer decal set

This specification mirrors the AC Schnitzer press car for that authentic show-stopping stance and sound. Drive-in drive-out conversion. All parts are genuine AC Schnitzer, developed specifically for the BMW G29 platform.

Optional Add-Ons

• Upgrade to AC3 forged wheels for reduced unsprung weight and a premium forged look
• Upgrade from spring kit to RS adjustable suspension for fine-tuning ride height and damping
• Shift paddle set for a crisper manual override feel

Why Enthusiasts Choose This Conversion

• Real-world pace from the 400 bhp upgrade while retaining AC Schnitzer reliability and manufacturer-backed support
• Precision handling from the lowering set and Michelin PS4S tyres for grip, steering feel and stability
• Roadster presence with a four outlet exhaust note that sounds right without drone and a cohesive aero kit
• OEM-plus finish with components designed and tested for the G29 Z4 M40i

Our team has installed this ACS4 conversion multiple times. Customers consistently report faster in-gear acceleration, smoother throttle response, improved confidence on B-roads and long-distance refinement that remains true to BMW quality.

Book Professional Installation

For expert fitting, choose MJ Modifications in Warwickshire. We offer a full install service and can provide a fitted quote, along with vehicle collection and return on request. Email info@mjmodifications.co.uk to request availability and a tailored estimate.

Compatibility

• BMW Z4 G29
  • BMW Z4 M40i

Part Number

G29CONV

Warranty

In principle, all AC Schnitzer products sold in the UK carry a two-year manufacturer’s warranty, or until the end of the 3 year BMW warranty period, whichever is longer.

*Performance upgrade warranty from new, conditions apply.

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