Local Z shop wants $2800 for high flow cats, off the shelf exhaust, and UpRev. I think you can help me do better.

I need everything. 140K on the car, cats are done, they keep fouling O2 sensors.

INTAKE
- K&N
- stock tube
- 5/16th plenum spacer

I really like the Invidia Gemini but they don't make it for single-exhaust sedans. What's my best option here?

HATE
- loud, raspy ****
- can't stand drone
- I'd like it to come alive at WOT, but be silent cruising on the highway

Everything I search for (including youtube sound clips) is either for Coupes or Sedans with dual mufflers. What's the best setup for us early-sedan guys?

THX

 

MD art pipes
xyz y pipe with cat
megan y back, or ISR single exit