I installed my flowmaster cat-back and I re-set the ECU. Ive only driven about 25 miles since then and my car feels like it has the same if not a little less power than before the flows. Is that just because the ecu has to get re-aquanted with things, or should that not matter?
catbacks dont change anything enough to need to reset the PCM. you are looking at maybe 10hp at most of a gain with a catback. especially with one that flows as poorly as flowmaster.
Your not going to feel any difference. When I put my flows on I felt nothing didnt feel like I lost or gained power just sounded different. Now put an O/R pipe on there and you will feel a difference, especailly if u have a 96-98 GT with 6 cats.