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I have magnaflow high flow cats and flow delta 40's with an h. My piping is 2 1/4" though, I think 2.5" is too big for our cars(unless it has a cam or some real performance mods)and personally think they sound like poo. Thats what I have and love it.
The thrush's seem to be a killer deal, i've heard a few in person on multiple cars and I like them.