They only make one kind of exhaust...RSR, as for the downpipe make sure you get the catback first or put them on at the same time. SAVE SO MUCH TROUBLE. The downpipe is the apexi stainless one. I know they also have that other kind but I'd much rather have stainless= no rust. The RSR exhaust will also have an adapter to go from your stock downpipe to the cat, because it is a TRUE 3 inch exhaust be aware of that.