MPx Dual Exit Exhaust System w/ Cat Downpipe, 03-05 Neon SRT-4

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Model Number: 220913-CAT

This listing is for the complete MPx Dual Exit Exhaust System with cat Downpipe. Please see our other listing for the Rear Section Only.

The MPx Dual Exit Exhaust System was designed from scratch to be the best flowing dual exhaust on the market, but we didn't want just good performance, we also wanted it to be durable and good looking.

Polished stainless steel pipes, dual polished tips, and beautiful rear Y section make this exhaust one of the most eye catching exhausts available.

Exhaust Features:

  • 16 Gauge Stainless Steel
  • 0.5" Thick Flanges
  • 3" Mandrel Bent Piping
  • Sectioned piping near rear axle to maintain a full 3" diameter through this tight bend.
  • Unique "Y-Design" rear section offering superior flow over other rear sections on the market.
  • High Flow Catalytic Converter

Downpipe Options:

  • Additional O2 Sensor Bung for use with an Air / Fuel Ratio Gauge. Please note, this custom service may require an additional 2-3 days.

To see the full benefits of this exhaust system, we recommend our MPx 3" O2 Housing. This piece is made from the same materials as the MPx Exhaust System.

If you are located outside of the continental USA, this item cannot be shipped by USPS and must be shipped by Fedex/DHL. Contact us via email to discuss further if you are outside of the continental USA.


Additional Options

Install Add'l O2 Sensor Bung

Model Number: 601904-WIDEBAND
Have an additional O2 sensor bung installed for use with an air / fuel ration gauge. Please note this custom service may Read more

MPx 3.0" 4-Bolt Exhaust / 03-05 SRT-4 O2 Housing Gasket

Model Number: 220915-GASKET
Do you need a replacement 4-Bolt O2 Housing Gasket for your 03-05 Neon SRT-4 or 03-07 PT Cruiser GT? We offer Read more

MPx 3.0" 3-Bolt Exhaust Gasket

Model Number: 220913-GASKET
Do you need a replacement 3-Bolt Exhaust Gasket for your MPx Exhaust Dual or Side Exit Exhaust? We carry spares of the Read more

MPx 3.0" O2 Housing, 03-05 Neon SRT-4 / 03-07 PT Cruiser GT

Model Number: 220915
Want the fastest turbo spool up, and throttle response you can get out of your factory turbo on your 03-05 Dodge SRT-4, Read more

Torque Solution Exhaust Mount Kit, 95-05 Neon / 03-05 SRT-4

Model Number: 220919
Torque Solution exhaust mounts will reduce exhaust movement and vibrations both under extreme racing conditions and Read more

MPx Dual Exit Exhaust System w/ Cat Downpipe, 03-05 Neon SRT-4, Exhaust: Store Name

Ask a Product Question

  • spencer
    I noticed it says add "additional" o2 bung does that mean it now done standard with a bung for the down stream o2?
    1 Answer
    • Modern Performance

      The downpipe has a bung for the downstream oxygen sensor. The EXTRA bung that you can pay for is to make it easier to install an air/fuel mixture ratio gauge. No need to buy it if you don't plan on installing a wide and gauge.
  • Austin
    Does this exhaust system have a resonator?
    1 Answer
    • Modern Performance

      It has a high flow resonator on the b pipe. If its too loud you can always weld on a ultra quiet resonator which we sell.
  • Stegner
    I have a garrett 50 trim with a 2.75 inch inlet how can I get this exhaust to work with my turbo?
    1 Answer
    • Modern Performance

      As long as the turbo exhaust outlet is a four bolt flange, and is in the same location as the OEM exhaust outlet flange, this will bolt up to it. Call us to discuss further.
  • Anonymous
    Does this exhaust come with all of the gaskets?
    1 Answer
    • customer service rep

      Yes, gaskets, and bolts are provided for installation.
  • Stephen
    Is this exhaust system C.A.R.B. legal?
    1 Answer
    • customer service rep

      No, the only part we have seen offered for the 03-05 Dodge SRT4, out of the hundreds we offer that is carb legal, is the AEM air intake. Every other part is NOT carb compliant for use in California.
  • Chris
    How much horsepower gain would I get on my car with this exhaust system?
    1 Answer
    • customer service rep

      You'll gain about 10 hp over the stock exhaust with mild bolt on items and more boost. We've seen nearly a 24 hp gain on a car making 350-360hp back in the day.
  • Matt
    Will the purchase and install of this exhaust without Cat , cause the CEL to come on ?
    1 Answer
    • customer service rep

      If you have a downpipe with no cat, and you have a stock pcm, you will get a check engine light. If you have a Mopar stage 1 pcm, or a Diablosport pcm flash, or any other pcm flash you wont have a check engine light.
  • Jordan
    Will the catted downpipe pass emission
    1 Answer
    • customer service rep

      Yes, the catted downpipe with exhaust will pass emissions and safety tests in every state except the state of California which has much stricter emissions laws (CARB testing).
  • Ryan
    Will I get a check engine since there is no catalytic converter? If not how does that work
    1 Answer
    • Customer Service Rep

      If your car has a stock pcm and you remove your catalytic convertor, you will get a check engine light. If you have a Diablosport flash, or any of the other pcm flashes that were ever made for the Neon SRT-4 you wont have a check engine light.
  • Chris
    Does the cat rob hp from the exhaust? If so, any idea how much?
    1 Answer
    • Customer Service Rep

      When testing a SRT-4 with about 300 hp, we see a difference of about 5 hp. With 400 hp, it would be closer to 10-15hp, and the higher the horsepower, the more power lost.
  • Ulises
    Is this legal in california ??
    1 Answer
    • Customer Service Rep

      If you are concerned about California Air Research Board testing (CARB) there is only two parts ever made for the Neon SRT-4 that are CARB approved and its the AEM air intakes. This is as of 10/10/16. You can use any other part you want in California if your particular city doesn't do emissions testing, or if you are in a testing area you can swap back to stock, then do your CARB testing then swap back to whatever parts you want.
  • Allan
    Is there an option to not add the resonator on the b pipe?
    1 Answer
    • Customer Service Rep

      No, there is no option to remove the resonator.
  • kevin
    if i get this exhaust with a cat will i get a check engine light?
    1 Answer
    • Customer Service Rep

      No, there is no check engine light with this exhaust with cat. If you get one without cat, and have a stock pcm your check engine light will come on but if you have any aftermarket tune (mopar stage 1/2/3, Diablosport, etc) they all turn off the light from coming on without a cat.
  • Adam
    How much does this weight?
    1 Answer
    • Customer Service Rep

      The total system with downpipe weighs in at about 55 lbs.
  • colton
    really looking into purchasing this set up.....will it bolt up to the stock turbo Or the BWS? if not what do i need for it to work with the BWS?
    1 Answer
    • Customer Service Rep

      Fits all OEM turbos, BWS turbo's, Mopar stage 3 turbos, and all turbos that have the same outlet location as factory. This means it will fit just about every turbo made for the SRT-4.