2025 Duramax Diesel Tuner. The best tuner to recalibrate your duramax engine should be one that makes you happy and meets your needs. Safely increase power and fuel economy for your 2025+ chevy/gmc 2500 and 3500 duramax l5p.

Safely increase power and fuel economy for your 2025+ chevy/gmc 2500 and 3500 duramax l5p. Additionally ppei is hands down the best tuning / custom tuner available when it comes to tuning any duramax,.