The quick way to take the rear muffler off an ND1: ISR's RC Series muffler delete replaces it with a 2.75-inch stainless pipe that flares to a 3-inch tip. Less weight at the back of the car and a lot more exhaust volume — that's the whole brief, and it does it with one pipe, a gasket, and two bolts.

Fitment caution from ISR: this has not been tested on ND Club models and may interfere with the bumper cover on those cars. If your ND1 isn't a Club, it's a simple bolt-on delete; either way, know that a muffler delete is loud before you buy one.

• Fitment: 2016-2018 Mazda Miata (ND1); not tested on ND Club models, possible bumper-cover interference (per ISR)
• 2.75 in stainless steel piping flaring to a 3 in tip
• Deletes the rear muffler for weight savings
• Includes: muffler delete pipe, 2.75 in exhaust gasket, 2x bolts, 2x nuts