I'm thinking about ordering kooks headers, a corsa cat-back, and electric cutouts. Which kooks headers are best for performance/sound? the catless,high-flow cats, or which model number? Also which are the best dual electric cutouts? How much is each of the 3, and where can I get a Corsa catback, dual electric cutouts and the best type of kooks headers all from one vendor for the best price possible? And what is the general install price for each of the 3? Thanks for your help and sorry for the messy wording.