Quote:
Originally Posted by AW BMW
I agree with you here, specially if you have stock downpipes with primary cat back exhaust. All exhausts on this car have loud cold start but that's only for the first 20 seconds or so, after that they are not much louder than stock at idle or light throttle. So in that sense I feel that the valves are not necessary and are over rated until you go catless all the way. I don't use the valves on my AWE resonated and it has gotten almost twice as loud since I first had it installed. Maybe I should have gone with a valveless exhaust and saved on whatever the extra costs were. If I were to have a fully catless v8 than I would probably want valves at that point because some get ridiculously loud.
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For those with Catless DPs, a Flash Tune can easily disable Cold Start if it's a nuisance.