ISR Performance Mazda Miata NB Circuit Spec Exhaust-(1999-2005)

The ISR Performance Circuit Spec Exhaust for the 1999-2005 Mazda Miata NB is a two-piece catback built specifically for the NB chassis. 2.5" brushed stainless front pipe mounts directly to the factory header, transitions through a mid pipe with integrated muffler, and ends in a polished stainless muffler with a 4" tip. Sheds about 18 pounds versus the factory system, which is real weight off the back of a Miata.

What It Does

Catback replacement for the NB Miata. The 2.5" piping flows better than the choked factory exhaust, expelling gases from the manifold more efficiently. The 18-pound weight reduction is significant on a car this light, and the integrated mid muffler keeps the tone civilized while the rear muffler with 4" tip delivers the aftermarket sound. Aggressive without being obnoxious, which is the sweet spot for a Miata that still sees street use.

Fitment

1999-2005 Mazda Miata NB only. Not tested on turbo Mazdaspeed Miata models and may not be compatible. Will not fit Euro-market NB Miatas. Mounts directly to the factory header at the front.

What's in the Box

• 1x 2.5" brushed stainless front pipe
• 1x mid pipe with integrated muffler
• 1x rear section with polished stainless muffler and 4" tip

Product Details

Brand: ISR Performance

Part Number: IS-CSEXH-NB

Type: Circuit Spec catback exhaust (two-piece)

Vehicle Fitment: 1999-2005 Mazda Miata NB (US market)

Excluded: Euro-market NB Miatas, Mazdaspeed turbo Miatas (not tested)

Material: Brushed stainless steel piping, polished stainless muffler

Piping: 2.5" front pipe

Tip: 4"

Mid Pipe: Integrated muffler

Weight Reduction: ~18 lbs vs factory

Connection: Bolts to factory header

Sold: Complete kit

Legality: Off-road and competition use only