Good-Win Racing Mazda Performance Parts

Miata 1990-2005 · Miata Exhaust & Mufflers · Catalytic Converter


Miata catalytic converters often clog with age and choke off performance. If your Miata won't accelerate strongly in the upper RPM range it may be a failing catalytic converter. Note that the 1990 through 1997 Miata came with a bolt in catalytic converter but the later 1999 through 2005 Miata had a converter welded into the exhaust midpipe. For additional information and larger pictures click into the individual Miata catalytic converter choices below.

RoadsterSport Midpipe with Catalytic Converter and Resonator, Federal version RoadsterSport Midpipe with Catalytic Converter and Resonator, Federal version
1999-2005
rating (1 Rating)

$369.00
RoadsterSport CARB CERTIFIED Midpipe with Catalytic Converter and Resonator RoadsterSport CARB CERTIFIED Midpipe with Catalytic Converter and Resonator
1999-2000
$499.00
RoadsterSport CARB CERTIFIED Midpipe with Catalytic Converter and Resonator for 2001-2004 Miata RoadsterSport CARB CERTIFIED Midpipe with Catalytic Converter and Resonator for 2001-2004 Miata
2001-2004
$499.00
RoadsterSport CARB CERTIFIED Midpipe with Catalytic Converter and Resonator for 2005 Miata RoadsterSport CARB CERTIFIED Midpipe with Catalytic Converter and Resonator for 2005 Miata
2005
$499.00
MagnaFlow Catalytic Converter - Direct-Fit MagnaFlow Catalytic Converter - Direct-Fit
1990-1993 · Miata

CARB Approved!

$350.42
$270.78
MagnaFlow High Flow Catalytic Converter MagnaFlow High Flow Catalytic Converter
1990-1993 · Miata

NOT CARB Legal

$187.91
$145.21
RoadsterSport High Performance Miata Catalytic Converter-FEDERAL Version RoadsterSport High Performance Miata Catalytic Converter-FEDERAL Version
1994-1997
$199.00
RoadsterSport High Performance Miata Catalytic Converter-CALIFORNIA VERSION RoadsterSport High Performance Miata Catalytic Converter-CALIFORNIA VERSION
1994-1995

(NEW CARB CORE 332105)

$239.00
RoadsterSport High Performance Miata Catalytic Converter-CALIFORNIA VERSION RoadsterSport High Performance Miata Catalytic Converter-CALIFORNIA VERSION
1996-1997
$289.00
RoadsterSport STAINLESS STEEL Straight Pipe RoadsterSport STAINLESS STEEL Straight Pipe
1994-1997
$85.00
$79.00
Racing Beat Miata Miata Race Connecting MidPipe with Presilencer Racing Beat Miata Miata Race Connecting MidPipe with Presilencer
1999-2005
$231.00
Racing Beat Race Pipe Racing Beat Race Pipe
1990-1993
$87.00
Replacement Catalytic Converter, NON-CARB Replacement Catalytic Converter, NON-CARB
1994-1997
$149.00

Current Specials!

Miata 1990-2005: Miata Exhaust & Mufflers: Catalytic Converter


MagnaFlow Catalytic Converter - Direct-Fit MagnaFlow Catalytic Converter - Direct-Fit
1990-1993 · Miata

CARB Approved!

$350.42
$270.78
MagnaFlow High Flow Catalytic Converter MagnaFlow High Flow Catalytic Converter
1990-1993 · Miata

NOT CARB Legal

$187.91
$145.21
RoadsterSport STAINLESS STEEL Straight Pipe RoadsterSport STAINLESS STEEL Straight Pipe
1994-1997
$85.00
$79.00

REVIEWS

As you can see, i placed another order for more parts for my car. I wanted you to know that I'm pleased at how quickly the wheels/tires came, and the radiator too. Great service and response time.

-- Jeff D.

After reading many other positive reviews on both the GWR and Miata forums I finally decided to buy this product. My main concern for many months was whether or not I was up to the task of installing the header. But with the excellent instructions on Brian's forum as well as several Miata forum threads it turned out easier than I expected. After receiving notice that the header would arrive on a Friday afternoon, I began the disassembly process. After about 3 hours I had the stock manifold out. Later that afternoon the new catted header arrived right on schedule. And it is a thing of beauty. I opted for the stainless version. Installation on Saturday morning took another 3 hours, although I could have shaved some time off of that but I was actually enjoying the process of double checking torque values and cleaning up my engine compartment. I already have the GWR catted midpipe, so that connection was a snap. I put everything back together, reconnected my battery, and went for a drive. NO CODES! Nice throaty sound with my RSII muffler, and a significant boost in power and low/mid torque. Another happy camper here. I since have added a M-E tune and I feel I have realized all of the gains that Brian has achieved on his 2012 project Miata. I've put several hundred miles on my Miata since the install with zero problems. This is the car that Mazda should have built all along. Thanks Brian.

-- Ron P.