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Toyota GR Yaris – Tried-and-Tested Upgrade Setup (297bhp ➝ 331bhp)

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This Toyota GR Yaris was in the Whifbitz workshop recently for our usual, tried-and-tested upgrade setup.

The car arrived with a strong base of modifications already fitted, and we completed the build with further performance, drivability and chassis upgrades, finishing with a custom EcuTek calibration to tie everything together.

Existing Modifications

  • MST V1 intake kit
  • Milltek resonated exhaust

Engine & Performance Upgrades

  • Whifbitz non-resonated GPF pipe
  • Airtec intercooler
  • Custom EcuTek tune

Driver Interface & Drivetrain Improvements

  • Whifbitz Alcantara steering wheel
  • Airtec torque mount
  • Powerflex upper engine mount insert
  • Powerflex lower engine mount insert

Suspension & Chassis Upgrades

  • Eibach lowering springs
  • Cusco front lower arm bushes
  • Full wheel alignment

Power Results

  • Before tuning: 297bhp
  • After tuning: 331bhp

A healthy 34bhp increase, combined with sharper throttle response, improved traction and more confidence-inspiring handling on the road.

Want a Similar Setup for Your GR Yaris?

If you’re considering a proven GR Yaris upgrade path covering engine, drivetrain and suspension — all supplied, fitted, aligned and tuned in-house — get in touch with Whifbitz. We’ll be happy to advise and get your car booked in.

👉 Contact us today to discuss your GR Yaris build.

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