ISR Performance Turbo Kit - Mazda Miata NB 1.8 - With RS T25/28 Turbo

ISR Performance Turbo Kit - Mazda Miata NB 1.8 - With RS T25/28 Turbo

ISR Performance proudly introduces its latest turbocharger kit for the Mazda Miata NB 1.8 engine. This kit is one of the most comprehensive options available while maintaining an affordable price, without compromising on quality. Designed for compact T25, T28, or GT-style turbochargers, it features a durable Schedule 10 tubular turbo manifold to prevent cracking, 304 stainless steel exhaust components, a chassis-specific intercooler with a sturdy mounting bracket, and polished aluminum intercooler piping. The kit also includes AN oil feed and water lines, plus an AN turbo drain line with an aluminum weld bung for the factory oil pan.

Tailored for aftermarket ECUs and MAP sensor use, this kit comes with the proven ISR RST25/28 turbocharger for a true bolt-on solution. On a stock BP 1.8 engine, this setup delivers 210 rear-wheel horsepower (RWHP) at 8 PSI of boost.

The modular hotpipe is compatible with ISR, HKS, GReddy, and TiAL flanges (sold separately). Note: A 2.5" hole must be drilled for intercooler routing.

Kit Includes:

• RST25/28 Turbocharger
• Schedule 10 Bottom-Mount Turbo Manifold
• Intercooler and Piping Kit
• Turbine O2 Housing & Downpipe
• Complete Oil and Water Turbo Lines with 10AN Aluminum Weld Bung for Oil Pan
• AFM-Delete Intake with Air Filter

This is the most affordable, complete turbo kit on the market.

Disclaimer: All ISR Performance products are designed for off-road use only. Legal only for competition vehicles that will never be registered, licensed, or driven on public roads, or for other exempted vehicles.

Updated March 18, 2025.