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Reporting back a few months later. My CEL is still gone, hasn’t appeared once. Unless there’s some software glitch with the ecu, this is working for my setup.

Justin at Freektune got back to me and said +/– 0.5 of 14.7 is normal. Crisis averted lol

I have a Gen 1 speed3, it runs great. I noticed though that my AFR today was 14.26-14.41 on cruising. I thought it was closer to 14.7 before… mods: 3” turbo xs catless downpipe and testpipe 3” custom aluminum modified mazdaspeed brand intake Autotech high pressure fuel internals. Damond...

Good catch Lucas! That fan does appear to be listed for 2010 + models. However, after a close inspection the connectors seem to be identical, so it should plug and play fine. Also, the housing of that fan looks like it has identical mounting points as the OEM fan. The control unit is mounted in...

As dead set as you both seemed on there being absolutely nothing I could do, I tried a Vibrant performance J-style spacer and an exhaust reducer and my check engine light has been gone since. So, If you have a first gen mazdaspeed3 try a j spacer out. It does the trick. Here is where I got...

Hmmm, ok. So even the options in this post https://www.mazda3forums.com/threads/catless-cel-fix.314582/ aren’t valid?

So then I’m just screwed? Surely there’s a way to eliminate the issue…can I modify the sensor to make it always read correctly?

I know I can’t tune it out. I’m asking if there’s a solid way to not cause the code to be thrown in the first place. Could I use an o2 sensor bung extension to get a content reading on the second o2 sensor?

Thanks for letting me know, I already thought I needed a tune but that confirms my suspicions. I am getting tuned by freektune as we speak, I made sure to already have the first map of his OTS+ map on my car before driving it. However, he will be sending me at least one more revision so maybe...

Just installed my turboxs catless downpipe and racepipe on my 09 gen 1 speed3. It sounds awesome. However, roughly 30 miles after the install, 3 miles into the third drive after the install (which I didn’t let it sit and warm up because I had to get somewhere), it threw a CEL with a P0421 code...

Worked like a charm! Now I can adjust my intake properly.

Fantastic. I'll replace it with some heater hose or something similar and some hose clamps. I didn't realize the corksport came with a replacement for that pipe! I thought that was just the bypass hose they offered. I have the bypass hose from them, it's nice but is a real pain to get on!!

I am trying to fit a Corksport Aluminum TIP in my 2009 speed3 with a Mazdaspeed brand 3” aluminum intake, which was previously modified before I got it used. The intake is a tight fit, but does fit in there. I am having some fitment issues with the hard plastic breather hose that goes from the...

Thanks for the advice! I got a Kicker CXA360.4 amp, 2 kicker csc68 for the rear doors, 2 kicker css68 for the front doors and tweeters, a kicker hs10 subwoofer, and noico sound deadening mat.

Thanks for the suggestion SnackMasterX! I would love to try that, but right now I’m at the outer limit of my budget for this project. In the future though I will look into that. Correct me if I’m wrong, but doesn’t an aftermarket radio add some DSP to the speakers? Obviously it’s not a...

What you said is true for gen 2 speeds, but I have a gen 1. There’s no rear sub on those, rather it sits under the front passenger seat. As far as I know, the amp is under the driver seat. Amp could be under the passenger seat though, I’m not certain. All I see is a black box that says Bose...

A little update for you all: After some discussion with a crutchfield rep and a dude on another forum, I will be ditching the pioneer TS-G520s and trying to fit the subwoofer I have under the passenger seat, where the stock sub is. If I can get it out, I think it will fit. Because I am...

Gotcha! I'll head over to one of those sites and see what I can find. Once I figure it out, do you guys want to hear how it gets installed?

I recently got a set of kicker CSS68 and CSC68 speakers to replace my crappy Bose door speakers in my 09 Mazdaspeed3 GT, plus some Pioneer TS-G520s for under the front seats. Along with those, I picked up a Kicker 46HS10 Hideaway Subwoofer with a 180-watt amp built in for the trunk. It comes...

Epic!! Thanks StayFrausty. Also, is there much of an issue with exhaust leaks beyond the downpipe? Obviously it’s better to avoid them but what is your experience should they arise?