Site Map
Off-Highway and Competition
(off-road vehicles only)
- Off-Highway Tuning
- EGR Delete (brands: Caterpillar, Cummins, Detroit, Mercedes, Paccar)
- DPF Delete (brands: Caterpillar, Cummins, Detroit, Mercedes, Paccar, International (MaxxForce))
- Urea (SCR) Delete (brands: Cummins, Detroit, Mercedes, Paccar, International (MaxxForce))
Big Boss®
Performance Parts
Ready to take action?
Talk to a Diesel Spec expert
Personalized estimate for your truck or fleet, response within 24 hours. 30-day money-back guarantee.
Contact Form
Talk to a DSI expert
Documentation, a call back from an advisor, an estimate for your truck or your fleet. An expert will contact you within 24 hours.