Getting TBE from invidia the Q300 now I'm deciding on the downpipe.
As on my P's I didnt want to commit to a full dual N1 system for my betty decide Q300 will be a more appropriate change.

So whats everyone's experiences with running catted or catless and is there a noticeable power difference?? I know its more louder and has that emission smell from an open throttle maybe because of my motocross days the smell doesn't bug me.

I was keen on going catted.. can save 250$ on catless and have less restriction, but can cope a +$300 fine and a yellow but the chances of someone looking under your car is slim unless you're at the pits.

From my friends wrx when he change to catless it had a very throaty sound... No pun intended

Much wow
many powerr
very shiberu

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Wannabe Boy Racer- WRX 09 Slim Sedan 268.6HP 376.0 NM @1.2 Bar

Much wow
many powerr
very siberu

Q300 invidia on catless dp will be quite loud, q300s sound awesome and are already louder that other muffled types.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

I was originally running a catted 3 inch TBE and found it wasn't loud enough.

I've now upgraded to cat-less everything including 3ich TBE, it is a noticeable difference but not a whole heap. Obviously gains on a dyno graph will show you the real difference.

On idle it's not overly loud I was very surprised as it was a very subtle note! But on WOT that's a whole different story.. It's insanely loud even at 3 grand!

As for yellow canarys I haven't been pulled over as of yet with the cat-less system.. Been followed a few times but nothing out of the ordinary.

I would recommend going cat-less IMO as I prefer the little extra gain and a very loud and in your face exhaust
But none the less comes down to personal preference and what your aiming for.

Hope this helped!



using the Perth-WRX mobile app

Satie...did you have Invidia?

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

Thats the first time I've heard someone say the q300 dual out being loud ahahha and i wanted the n1 to start with! the n1 must be deafening then..

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Wannabe Boy Racer- WRX 09 Slim Sedan 268.6HP 376.0 NM @1.2 Bar

Much wow
many powerr
very siberu

Nah just the Ultrex drift spec cat-less. To be honest I'm very happy with there system! But Invidia N1 racing cat back Is on the cards in the future.


using the Perth-WRX mobile app

Its quite loud compared to other muffled types, thats what I meant.. of course nowhere near N1 territory.
I must have read that wrong but you saying you're staying away from N1s had me thinking that you're worried about noise.

You should come have a listen to my N1, will hurt your ears but I like it this way...neighbours don't

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

Yeah ok I thought so... by design the Invidia systems are louder to start with.

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

I think you will find the fine for removing your cat a hell of a lot more than $300.

I was considering a Tomei catless down pipe for my Rex that rarely gets driven on the street and I'm not cop bait at 37 YO. Still not worth the risk . . .

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"ALLPAWS" 2014 WRX RS 40 - modding very slowly.
2002 Mitsubishi Airtrek Turbo R - Ralliart Edition (daily)
2010 Nissan GT-R - when the Missus let's me drive it :)
Crotch Rockets . . .

Yeah from what I've seen in videos Invidia systems just seem louder in general I suppose videos don't do justice for the real thing!

Would be keen to have a listen to your Invidia system in the near future! To get a feel for how loud those systems are!


using the Perth-WRX mobile app