Exhaust need retune?

[DerricksSHO]

Im kinda at a power stand still right now. Ive worked and talked with LMS and they are a great company and awesome customer support. With that said they dont do much custom stuff unless they do it. My car right now has a full down pipes back to tip free flowing exhaust the guy that does custom race car exhaust for a long time im currently running a true duel and I dont know if this is causing my problem tomorrow we are going single 3 and go from there car acts like it needs more fuel. I cant WOT the car starts missing its got new plugs gapped .028, 02 sensors, all fresh fluids. The car cruises fine drives nice no miss untill WOT. Im being told that I dont need any upgrade to my tune because the down pipes are already in the tune I have now. If I have a much more free flowing exhaust I would think it would need it. once again correct me if im wrong. Thanks

 

[6500rpm]

Do you have any way of seeing what your fuel trim and Ho2s1 values are at WOT?

 

[limited02]

From what I understand, the gain in power comes from the downpipes which you are tuned for. The cat-back you've done provides very little gain and is mostly for sound/weight savings so there's no need to tune for it.

I believe 2013+ had issues with the fuel pump and maybe yours is acting up? Which version tune are you running and have you tried a different tune?

 

[DerricksSHO]

I have torque app but am new to reading this stuff I know enough to get me in trouble.. There have been gains with down pipes back I say down pipes back because im running a high flow race style threw open exhaust system. I took it to my friends shop today and removed the true dual set up and replaced it with a single 3 car seems to be running better didnt lean on it to hard its 36 out so what ive learned from this custom anything including exhaust equals custom tune not canned. Thanks guys and hope this saves someone from the same head ache I just went threw. A lot of wasted money also.