i went to the shop today and they said that the cats i had on there were already high performance, the one in the front is in good condition but the one in the back was dead. i had them replace the rear cat with a new high flow and i have way more power. also, the sound is a little better than before.
i refrained from getting rid of the muffler because i have the single exhaust, it sounds pretty good now tho so im pretty happy with it.
thanks, brenden