Which to replace Catalytic Converter? Link Inside!
 

Hello, I have a 2001 Auid A4 Quattro 1.8T sedan. I have a full borla exhuast Cat back with Unitroic Octane Chip. I love the sound out of my Borla, but i think i want it alittle louder and really get that Borla Exhaust! Im looking to replace the Catalytic Converter with one of these 2 or maybe something different but as simple.

I know that from what i read as long as I do a Sensor Spacer I should be good for Codes, so here are the 2 im looking at:

Audi B5 A4 Quattro 1.8T > Exhaust > Performance > ES#1844140 B5 1.8T Race/Cat Delete Pipe Kit - ATP-VVW-138
EuropaParts.com: 034Motorsport High Flow Catalytic Converter (1.8T)

Which will be louder and work good with the Borla?
If i put the spacers in both should i have no problems with codes?

help me out please! Thanks