I have a 2000 V6 auto, it has a cai (off brand) and what looks like 2 1/4 exhaust with flowmaster mufflers. I want to put the windstar intake and new cai, 65 mm or 70 mm throttle body and upgrade the exhaust. It has a exhaust leak on the passenger side ( either the manifold itself or gasket not sure). What brand cai, throttle body and size exhaust and muffler or any other upgrades will bring the car alive?

 

The passenger side header is prone to cracking. I replaced the ones on the wifes 03 with a set off a 96 which are better made.