hey for you guys who did the 5s turbo....

who used the stock 3s dp and primary cat...if you did use it , did the a/c lines get in the way?

you have to bend them down a bit, its hard to with your hands, your going to have to get a sturdy object to prop on it and hit it with a hammer, but use a cloth so you wont do much damage to it. it needs to be bent about 1/2" to 3/4". you wont be able to use those brackets for the lines anymore.

would it be a better idea to use an aftermarket dp?

A custom one, yeah