I am swapping out my turbo D-series for a stock JDM B16 for reliability, my catback is for a turbo car and it's 3". I was looking into getting a high-flo cat and an Inexpensive quiet catback for the car that matches with the stock JDM exhaust manifild. Is the Exhaust Manifold on a JDM B16 2-1/2" (the same as a 99SI?) Also, would a cat/catback designed for a 99SI fit properly on a swapped 99EX? Basic questions, but I just am not sure, Thanks