Well I sarted looking for an exhaust and cat for my 98 SVT. What system should I get since the car is stock? Looking for better sound and mpg. Should I get a high flow cat or take it out? What would be my best option? Also should I go ahead and replace the o2 sensors? How many do I have?

Thanks, Jason D.

1998.5 T.ted SVT 20% tint front,5% tint rear,white hvac,Roush springs,ST200 Struts, FMS wires, metal waterpump. Car is For Sale, Please contact me for more info.