Pre-Cat delete

[Daniel Park 2]

Ok, So right now I have dual straight pipes, with my 2 cats and 2 pre-cats. Was wondering If I was to delete the 2 pre-cats and weld pipes in replace, would I be able to pass emissions. I would also like to know if there are any gains in this, like low end or high end. or neither. And if deleting the 2 pre-cats make the exhaust any louder. The pipes are 2.25". don't know if thats inside or outside.

 

[WXMotorSports DecalsPartsAccs]

Be prepared to throw a lean error code "check engine" light with a missing cat. The O2 sensor will trigger it and possibly have the engine adjust to compensate. If anything, you might gain more back pressure (probably not) and maybe 1 HP. And, it will be louder.



What are you trying to gain from it because I see zero benefits but lots of potential problems. Oh, and if it's under warranty? Consider it no longer after removing it.

 

[Rick Hite]

I do not think you would be able to tell the difference you would have to take all of the cats off

to be able to tell the defference it will be louder.

 

[Travis Munday]

Just buy a Y-pipe, as that's what its doing. It removes the pre-cats and strighens up the exhaust tubing from the manifolds to the rest of the system.

 

[Daniel Park 2]

All I really want is the exhaust to be more throaty you know? and deeper and alittle louder.

 

[Travis Munday]

That can all be done with the muffler, if all you want is to change the tone.

 

[Daniel Park 2]

If I was to change it to say...Flowmaster 40 series, You think that would make it more of a deep bubbly kind of sound?

 

[Jeff C]

You will not throw an error code. I have run my ST with no tune for over a week with no codes.

 

[Travis Munday]

I'm not really sure there, karma. I'm not real familiar with what each of the exhuasts sound like. Spaceman Spiff has a project with a slew of exhuast sound clips that is worth a listen to help decide what each one sounds like.

 

[Larry Phillips]

My ST has a Flowmaster 40 on it. Go into my library, in the Louisville 06 folder there is a burnout video named Larry 1. Play that to hear my exhaust.