Like many have stated, would definitely start with a catless header and a tune to get the most "gains"; perhaps even get an axleback/catback to clear the "tone" a bit.
Personally, I've upgraded each exhaust component separately overtime because I was doing research on which parts fit my budget and what appealed to me.
Since you are doing it all in one go, definitely do some research on your ideal setup:
- How much are you willing to spend?
- How loud do you want your racecar to be?
- Will the drone be a problem?
I recommend keeping at least one cat/resonator to lessen drone.
Try looking through the used market to save some money. The cheddar saved could be used on buying new gaskets.
Good luck on your search!
