3 inch turbo back questions?

[Boostinspeed]

I no i got ?s but better to ask then blow my motor, i was wondering what i should go with , with exhaust? i no i am going with 3 inch dp, with 2.50 piping back or go with just 3 all the way? the only thing is that i was wondering about my car running like sh^^ because of it having no cats at all , so let me no if it will help or make it slower, or...get a avc controller...thanks guys.(doh)

[KyRaceFan]

first off, use some punctuation, so we can actually read what your questions.
second, use the search button, since this has been gone over and over.
The car running rich has NOTHING to do with the cats, and its this richness that prevents the motor from blowing up.
No cats, and bigger exhaust will make the car faster. Less restiction.
Do you know what avc means? Save your money, and get a Manual Boost Controller and a decent boost gauge.