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ISR

Circuit Spec Cat-Back Exhaust 2.5-Inch Stainless Steel

$605.00 $574.75 Save $30.25

SKU: IS-CSEXH-NB

In Stock
In Stock
Ships by Aug 3
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30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The ISR Performance Circuit Spec Exhaust system is specifically designed for the 1999-2005 Mazda Miata NB. Constructed from durable 2.5-inch brushed stainless steel, this 2-piece cat-back system aims to provide an aggressive exhaust tone. It includes a polished stainless steel muffler with a 4-inch tip, along with the necessary gaskets, bolts, and nuts for installation. Additionally, all ISR Performance products, including this exhaust, are intended for off-road use only and are legal in California solely for racing vehicles that will never be used, registered, or licensed for highway use. This exhaust offers a roughly 18lb weight savings over the stock exhaust system. The system includes one stainless steel muffler with a 4-inch tip, two 2.5-inch exhaust gaskets, four bolts, and four nuts.

MIA's Description

The ISR Performance Circuit Spec Exhaust is a two-piece exhaust system designed for the 1999-2005 Mazda Miata NB. It features 2.5-inch brushed stainless steel piping and a polished stainless steel muffler with a 4-inch tip. This exhaust is intended for competition vehicles only and may not be legal for use on public roads.

Fitment

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Specifications

BrandISR
Part NumberIS-CSEXH-NB
CategoryExhaust

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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