DP + Cat question

311mp3

Member
:
01 mazda mp3 06 mazdaspeed6
so i have a corksport racepipe, and i want to get a atp DP, if i get the dp with the cat will that replace the racepipe or is the cat IN the dp. in ortherwords is the difforance between the catted and catless dp an add on at the end of the dp.
 
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