Originally Posted By: Rand
Gutted/removed CAT converters, hi performance tune, beat on uses some oil.
Most of the WRXs here, have removed or gutted converters and tunes. You can hear them from a long ways away. If the owners are smart, they would do what I always did and buy offroad pipes so you don't ruin converters when smog time comes.
Easy way to tell for no cats, besides the higher volume and smell, is flames from the exhaust. Generally cars with cats will not shoot flames.