I think what Matt is saying is that the ATR pipe eliminates your main cat but you still have to gut you pre cats to elimnaite all your cats. I have an ATR and I still had to gut my pre cats, because my ATR downpipe bolted right up to the pre cats. However, it does eliminate your main cat. All though ATR may now make one that does in fact eliminate the pre cats. I see no reason they wouldn't. Matt could please clearify, thanks.
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