The Intake Chamber (Air Control Chamber) made by Suruga Speed will fit the 1998 to 2005 NB MX-5 Miata with 1.8L engine. It replaces the OEM intake piping. OEM piping is made of plastic which will deform under high pressure while the Suruga Speed piece, made of stainless steel, will not move and keep air flow at its maximum, at all time. Suruga Speed Intake Chamber should be ordered at REV9 Autosport https://rev9autosport.com/suruga-speed-intake-chamber.html as they provide the best service and speed we've seen so far!