When I purchasd my car it had hooker aero chambers on it. Shortly thereafter I upgraded my exhaust and switched to the dynomax ultra flo welded and I can tell a big difference. The turbo spools alot quicker now than before. I'm sure some of that comes from the upgrade from 2 1/4" to 2 1/2". I'm not certain whether the hookers are chambers of straight thru and I've not got any experience with flowmasters on a turbo car, but everyone I talked to before I purchased my mufflers said to stay away from anything with chambers. Hope this helps.
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