ok. i have an 04 RX8 with a greddy turbo kit.. im not a beginner to turbos (see sig) and i know the turbo thats in the kit sucks as well as the couplers.. ok.. what i want to know.. is whats a good replacement.. my greddy is completely shot!! also the car is POURING a s*** ton of smoke out the exhaust.. it starts about 20 seconds after turning the car on.. and doesnt seem to stop unless i rev the motor (only do it when warm) then it will start smoking again about 10 seconds after it comes to idle.. i know some is to do with the turbo.. but ive never seen a cloud of smoke that big from a turbo seal going bad.. it has a Check engine light for APV valve stuck open and manifold pressure high.. i changed the leading spark plugs with a step colder bc of the turbo.. the trailing looked great so i didnt change them... WHATS WRONG.. HELP.. i want to drive the RX8 again..