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Hollowing Cat converter Grf


Vik

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I did it to my GRB. Maybe with a stock exhaust it would of made it more audible but I really didn't notice much with the super loud R400 catback.
I've gone to a local Subie mechanic for WOF’s for the last few years and they’ve never failed the Legacy for having the same thing done, VTNZ used to pass it too.

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Ahh sweet, thanks all for the reply! I will give it a shot and let you all know what the results are. 

 

I have taken a measurement of Noise level(decibels) so will post a before and after just incase if any future soooby wants to take a shot on this. 

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4 hours ago, Andy_Mac said:

 

Nah hasn't been for me with either car. Jap ones don't seem to use the o2 sensor to check for cat efficiency the way US one's do. 

Thanks Andy, yup. I'm all good, did not make any difference to sound though but response has improved alot. I'm happy though. 

 

Next on list is muffler delete..... Thanks all

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2 hours ago, Vik said:

Thanks Andy, yup. I'm all good, did not make any difference to sound though but response has improved alot. I'm happy though. 

 

Next on list is muffler delete..... Thanks all

 

Make sure you do a lot of research with muffler deletes on these cars. Almost all aftermarket setups are extremely droney even when not too loud. That's why the factory muffler is such a monster. 

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