ok buying a header/dp/cat/catback combo

what should i go with?

1.5 cerameric?

1 3/4 cerameric?

1.5 high temp paint?

1 3/4 high temp paint?


and 3in dp with 2.5 out?

or

3in with 3 in exit?

i want my catback to be 2.5 inch so i assume 3 in with 2.5 out?

 

1 3/4 ceramic 3in dp 2.5 out sounds good...if they have a 2.5 dp that would be better tho