ISR Exhaust Mazda Miata NA 1.6 / 1.8 (89-97) Circuit Spec Stainless w/ Midpipe

Fitment Information

• Mazda Miata NA 1.6 (1989, 1990, 1991, 1992, 1993)
• Mazda Miata NA 1.8 (1994, 1995, 1996, 1997)
• The current NA Miata exhausts have been tested on the OBD1 & 2 1.8L NA Miatas and do feature a secondary o2 bung.

Fitment Note: Two engine-specific variants are available on this listing. Select IS-CSEXH-NA16 for the 1989-1993 NA Miata with the 1.6L B6ZE engine, and IS-CSEXH-NA for the 1994-1997 NA Miata with the 1.8L BP engine. The two variants use different mid pipe flanges to match the respective engine's downpipe outlet. Selecting the wrong variant will result in a non-fitting mid pipe. 

Emissions Compliance

• This is a catback exhaust and does not alter, replace, or modify any emissions equipment.  o2 sensor is not relocated on this exhaust. This product does not require a CARB EO or a CARB sticker.

Specs & Features

• Direct bolt on
• Includes an o2 sensor bung in the factory location
  
• This kit is a mid pipe and muffler system (catback) that connects at the factory downpipe outlet behind the catalytic converter.
• It does not include a front pipe or catalytic converter delete. The factory catalytic converter and downpipe are retained.
• Piping is 2.5 inches with a brushed stainless finish throughout and a polished stainless muffler exiting through a 4 inch tip.
• All gaskets, bolts, and nuts required for installation are included.
• ISR designates this product for off-road and competition use only. 

What's included?

• 1x Mid pipe
• 1x Stainless steel muffler with 4" tip
• 4x 2.5" Exhuast gaskets
• 6x bolts
• 6x Nuts

Pairs well with:

• BC Racing Coilovers Mazda Miata NA/NB (1989-2005) 30-Way Adjustable A coilover upgrade to complement the exhaust on the NA Miata. Pairing an exhaust and coilovers covers both the performance sound and handling improvements that define most NA builds.
• Eibach Front Sway Bar Mazda Miata NA (1990-1993) 24mm Anti-Roll 5517.310 A front sway bar upgrade to reduce body roll and sharpen handling response on the NA Miata, complementing the exhaust as part of a complete performance build.

OEM Part Numbers

• NA 1.6L Muffler Assembly: Mazda N351-40-100
• NA 1.6L Front Exhaust Pipe and Resonator: Mazda N351-40-600
• NA 1.8L Muffler Assembly: Mazda NA01-40-100

The ISR catback replaces the factory muffler assembly on both the 1.6L and 1.8L NA Miata. The factory front pipe and catalytic converter are retained. Buyers can verify OEM part numbers using the Mazda parts catalog with their VIN or chassis number.

ISR Performance Exhaust systems are made to perform.  Each exhaust is built to provide the best sound, best performance and give your car a clean, modified look.

ISR Exhausts are designed to be a direct bolt on and require no modifications to install.