I have my 93FD now and did a oil change a week ago and noticed my car has a 3in DP and high flow cat mated to stock axle back exhaust. Will I be safe from boost creep? Still has original intake piping and filter.

 

You should be fine with that setup. With any sort of cat there is enough backpressure still..usually. Lol just make sure it isn't punched out.

 

Word... With stock intakes and ic the stock rear section should help with backpressure enough to not see any dangerous creep levels. I am assuming you don't have an aftermarket ecu? If not, get one before you do any other mods

 

A boost gauge wouldn't be a bad idea...