So I've been wondering this for a while. Who has taken all the cats out of their N/A? I removed the rear ones and I've been debating taking out the front ones but I'm not sure about it.

I have two questions:

1.) Gains?
2.) How do you bypass the O2 sensor behind the cat so it doesn't throw a code.

I'm not worried about the legality of it, I live on an island where if you take your eyes off your car they'll rip off the cats and sell them.

 

Shameless Needswings plug here, but... if you want it done RIGHT, these are what you want:

NeedsWings SRT6 Cat Delete Downpipes

Yes, they're expensive but thorough, LOL... You may lose a bit of low-end torque with these, but you'll gain a bit on top-end.

Might be a bit extreme for a N/A, but if you want to remove ALL cats for maximum flow, this is the best way to do it without completely hacking up the system.

I think if Rob would offer these in mild steel (aluminized) they would probably sell in greater numbers... especially just the basic pipes w/o the cutouts. $500 would be an easier pill to swallow for most folks.

Cat-back systems simply don't yield any measurable horsepower on our cars with the factory cats in place. Not to mention, the drone. But a cat removal with the OEM muffler... you get a nice deep tone, horsepower, and zero drone.

In other words, spend $400 on a catback and get noise... or spend the money on these, and get power.

Cheers,

 

does removing those cats on an N/A actually yield power gains? Or are you losing the back pressure that you want when you don't have forced induction?

 

I think a little backpressure in this case is optimal...

Personally I'd pop off the rear cats, leave the front cats in place and opt for something like the OBX catback. You won't gain much power, but the sound is nice and since the OBX catback has a resonator, the drone should be minimal.