Clogged cats on my a4 3.0, need ideas for this setup
 

Have a 2002 a4 FWD 3.0 that has clogged cats that i would like some ideas on what to do to add performance and not hurt the reliability of the car.... I dont really want to drop big coin to buy new cats if i don't need to. I'm new to the euro tuner game and I love this car... Please help with some suggestions