Going catless
 

Hi! I have a 2018 brz with a ft speedfactory catted UEL header and Motiv high flow cat front pipe. I'm running the open flash v2 tablet tune. I've been running this set up for about 2 years. Certain points when driving the car and revving up or deceleration, it seems like it should back fire. Like it would sound natural. I don't like popcorn tunes but I'd like a little sound every once in a while. I was wondering if I gutted my cats and ran the catless tune on openflash, what all would change. For better or worse. It just sounds unnatural with no pop or sound ever. Thanks!

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Pop tunes are trash and people that do them are trash scene queens.

I'm not trying to do a pop tune, just something with a little more natural sound to it. Right now it sounds weird, it's hard to explain without hearing it. Sounds like it's missing something

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Pops and bangs are not natural for a small displacement NA engine.
Pretty sure most of us have heard these before.
Gutting the cats will let more of the Subie "rumble" come out but at the expense of volume and drone. It will also stink.

Fify

Just remember that the experience you may be lacking every once in a while will become an experience that is all the time.

Do it!! Your happiness is more valuable than what other people think

Trust me, you will have a lot fun

Just get a catless header and leave cat in the front pipe. No smell and plenty of sound.

Are you talking "subi rumble?"

https://www.youtube.com/watch?v=256n0ht2Sw0

I spent years working to exorcise pops, bangs, and farts from a variety of carbureted engines. The unnecessary racket carried a stigma of sloppy maintenance and poor workmanship.

Sure WEC and some IMSA cars make awful rackets on overrun, but for those things two things, and two things only, are important - power and (sometimes) reliability. When the WEC/IMSA cars ran at COTA a while back I’d go every year. One year every 911 that came by backfired on every upshift. One loud BANG and that was it. Next year the bang was gone. My guess is whoever was supplying the fuel/ignition maps killed it.

I’m not sure what about the extraneous noise is “natural.” It’s caused by unburned fuel igniting in the exhaust. Why is that “natural?”

A) it is gong to be loud!
B) it is going to smell!

As above I would not gut the cats but get a catless header and front pipe. That way you can go back or just go with the cat in the front pipe.

You will have the smell also

Yeah, vacuum metering fuel is inferior for a lot of reasons. A lot of small turbo race cars like rally cars used to use it intentionally for anti-lag, but that has really fallen out with how efficient new turbos are for quite some time now.

Maybe they are trying to hot blow their ebay mock diffusers ala 2010 era F1 :iono:

https://www.youtube.com/watch?v=BmGgvHflXgc

Fully catless I would occasionally get a burble from the exhaust under certain conditions. Just deleting one isn't going to do it.

I do not recommend fully catless if it's a stret car/daily. Exhaust fumes stink a lot and is annoying.