Catless Downpipe with No Tune '23 A91-MT

[A91MT- JR]

Recommendations? Anyone running into issue running catless and no tune?

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[DarkZupra]

Youll throw a CEL and not gain much power.

 

[MYA90SUPRA]

Recommendations? Anyone running into issue running catless and no tune?

Like dark zupra said just a light to deal with. No performance issues will happen.
You will be just getting a sound change

 

[NitroYellowMKV]

minimal power gains, more so faster turbo spool, prob will have a cel even with a mini cat, but I would still try as sometimes it stops a cel. lot more sound, overrun, but also smell. if you need a good catless I have a few MAD in stock, shoot me a PM

 

[6SPDA91]

@kingdooksdb has a downpipe and just got tuned. He's the best person to ask about this.

 

[Rhane]

I have catless dp with o2 spacer. No issues on the a91-mt other than it sounding absolutely crazy will be tuning once bm3 customrom is available though.

 

[kaj]

I have catless dp with o2 spacer. No issues on the a91-mt other than it sounding absolutely crazy will be tuning once bm3 customrom is available though.

Which spacer? I had a catted DP with spacer and still had a CEL.

 

[RyanA90]

Recommendations? Anyone running into issue running catless and no tune?

Kenji Garage and Armytrix are some of the few that dont throw a CEL due to having "built in cat simulator/ CEL delete"

 

[Rhane]

Which spacer? I had a catted DP with spacer and still had a CEL.

Ryan already mentioned it, but it’s Kenji Garage. It’s built in o2 spacer. Works like a charm.

 

[kaj]

Ryan already mentioned it, but it’s Kenji Garage. It’s built in o2 spacer. Works like a charm.

Oh, it's the downpipe. Not a spacer. Hmmm...

 

[eqi]

Just stupid question: why not buy any catless downpipe and add o2 spacer (mini cat converter) between dp and sensor?

 

[6SPDA91]

Just stupid question: why not buy any catless downpipe and add o2 spacer (mini cat converter) between dp and sensor?

From what I've seen on other threads, 400 is the magic number for your cat to not throw a CEL. This seems to be the case of catted and catless, regardless of the spacer.

Only way to fix is tuning.

 

[eqi]

So 400cell is “the goal” to prevent CEL.
Quick search : https://www.racdyn-usa.com/PROD/130+10+10+013.html
40 dorrarrrz
Who will test the spacer?

 

[Rhane]

Just stupid question: why not buy any catless downpipe and add o2 spacer (mini cat converter) between dp and sensor?

Honestly I was just lazy and wanted an AIO solution

 

[Brizzy]

Kenji Garage and Armytrix are some of the few that dont throw a CEL due to having "built in cat simulator/ CEL delete"

Can second the kenji for me personally, so far no CEL

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