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  1. Second Cat Removal Gains?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Hey guys, My second post on the forums, but I have read a ton over here and love it here. I have a 2016 BM Mazda3, Skyactiv-G 165 (no 2.5 here in Namibia), named her The Shadow :laugh2: I have not done much to her since I bought her back in 2016, put on some 18x8 wheels wrapped in 225/40R18...
  2. Magnaflow cat back for sedan with dual exits.

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    I hate to create a post just to ask but has anyone ever installed this magnaflow cat back with dual rear exits for the sedan before? Here’s the link and a photo I got from a YouTube video. https://www.magnaflow.com/products?partNumber=15294 https://m.youtube.com/watch?v=5N7N6-401v4
  3. Has anyone removed the second cat?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    hey all, i am thinking of removing the second cat, which is unmonitored, and keeping the stock resonator there, has anyone done this? did you feel any difference in perfomance? (loss, gain, or the same?) i just want a bit more sound without the expense of the cs midpipe which is 300 dollars...
  4. Corksport cat back mid pipe/ corksport sri

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Wanting to upgrade my mid pipe/ res for my mazda but not sure if I should just get it custom made. I’ve got a muffler delete already and I don’t want to lose a lot of power by not knowing the benefits or losses before istalation and money for just getting it shipped here (Australia). Also with...
  5. deleting 2nd cat question

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    hey guys, i was wondering, has anyone removed the 2nd cat on their 3rd gen? im thinking of doing it but i dont want to lose hp/torque. i know the corksport catback removes the second cat, but idk if their res in their midpipe is special for creating backpressure or something. so, my question is...
  6. 2013 MS3 CBE $180 obo

    Buy / Sell / Trade
    stock mazdaspeed3 cat back for sale. As is, no hardware. Looking for $180 obo, Local pickup in Las Vegas area only.
  7. Axel Back or Cat Back Exhaust?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Hey guys, new to the forums. Just bought my first Mazda. 2017 Mazda 3 Sport GS. 2.0 Looking to start building up her performance. I have been lurking the threads over the last few days and seem to find people installing AxelBacks more often than CatBacks. I was hoping someone had some insight...
  8. Void warranty with cat back exhaust?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    I've heard a lot of information from both sides on this topic so what's the real answer... Will my custom cat back exhaust void my warranty? I have a 2016 Mazda 3 btw and live in California.
  9. Intake Resonator Delete?? Custom Cat back?

    Engine / Drivetrain
    So I have a 2016 Mazda 3 i-sport and was wondering if anyone has tried a intake resonator delete on this model and how to do it? If you guys had step by step instructions that would be great! Also has anyone gotten a custom cat back exhaust made and if so how much did it run you and how much...
  10. 2012 Mazdaspeed 3 OEM cat back exhaust

    Mazdaspeed 3 Parts - Buy / Sell
    2012 Mazdaspeed 3 OEM cat back exhaust with around 30k on it. $180.00 Rather have local pick up. (Pleasant Valley NY 12569).
  11. 304 stainless steel dual cat back exhaust

    Mazdaspeed 3 Parts - Buy / Sell
    i have for sale dual exhaust for mazdaspeed 3 2nd gen for 600$ for more info and pics call or txt 7085391410
  12. Anyone deleted first cat?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Anyone here have done first cat delete? Want to know if there will be any engine check light out after delete or other problems. Would like to try del first cat Currently have deleted second cat, straight through resonator and semi flow exhaust but sound wise still acceptable
  13. 2nd Cat

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Anyone remove the 2nd cat and put a straight pipe? Does it mess up any of the sensors?
  14. Anyone have done stock exhaust with high flow cat?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Anyone have done stock exhaust with high flow cat on our mazda 3? I wonder how it will sound. I currently modify my oem muffler into high flow but there isnt any much sound as compare to stock. anyone care to share?
  15. Cork sport cat back legal in CA

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    I was thinking of getting the corksport cat back but saw that it requires you to remove one of the catalytic converters. Emissions in CA is a pain, so will removing one the cats make this illegal in CA or any other states that has strict emission controls? Such a nice sounding exhaust.
  16. WTB stock MS3 cat back. Feeler.

    Mazdaspeed 3 Parts - Buy / Sell
    Looking for a cat back exhaust for my MZ3 hatch. Unless I'm mistaken I read a stock MS3 exhaust will fit and has better flow than my stock exhaust. Ive got a msds header in the mail and have seen the CS, MagnaFlow and RB exhausts but don't have the coin. Feel free in add input/suggestions.
  17. High Flow Cat

    New Member Introduction & Forum News/Guide
    I'm new to the forum but ive done a ton of research and cant seem to find a high flow cat for my mazda. I have a 2010 Mazda 3 Sedan 2.0L. Anyone know who makes one? I dont want to buy a whole exhaust system. Thanks
  18. msds headers/magnaflow cat back 2.5l sound videos?

    2010-2013 Mazda 3 Engine and Performance
    So ive been searching and checking out different exhaust videos for an idea of what exhaust I want to order. Ive pretty much found every OTHER exhaust combination. I found a magnaflow catback/msdsheader vid but it was a poor one, guy maybe peddled to 2000 rpm a few times and that was it) and...
  19. Installed MSDS header and HF cat, no CEL!

    2010-2013 Mazda 3 Engine and Performance
    I had an MSDS header installed on my car today along with a high-flow catalytic converter in place of the secondary catalytic converter, it is now the primary converter with the 2nd O2 sensor located after that converter, the first O2 sensor is in the stock location. I drove in a variety of...
  20. 2nd cat advice and muffler flange

    2010-13 Mazdaspeed 3 Engine and Performance
    Guys I'm going to delete my resonator but I was planning on installing a 2nd highflow cat brand magnaflow with a straight pipe piece deleting the resonator but not sure if its worth it or should I just leave the 2nd oem cat? Do you guys know where I can find a 5.5" wide muffler flange? We...
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