So this year I bought a 2012 Mustang 3.7 liter manual with a bunch of performance mods already done.…
So this year I bought a 2012 Mustang 3.7 liter manual with a bunch of performance mods already done... bigger throttle body, cold air intake, shorty headers, BBK cat-less X-pipe, MBRP mufflers and a fancy MAF sensor. As you can guess, it runs pretty rough and developed an exhaust leak after a couple weeks as the backfiring tore apart the already poorly installed exhaust system.
I was getting all kinds of CELs so I switched out the pcv valve first to no effect. Then I replaced the fancy MAF sensor with a cheapo one and it ran better but that didn't last, likely because exhaust fumes were still getting into the intake so I may need yet another one, assuming exhaust fumes damage MAF sensors. I also had a bad o2 sensor but the previous installer didn't use the anti-seize goop so the bung got stripped.
So... I switched out the cat-less x-pipe for the catted version with 4 new o2 sensors and it sounds much more civilized and smooth but it still pops inside the header whenever I gun it. I like the power and the exhaust note the car has now but it's still running a bit rough with inconsistent performance. Rather than converting it back to a stock intake, I would rather performance tune the car, which brings me to my question for you.
There's only a couple places around Chicago that do performance tuning and it's costly. One tune can range anywhere from $450 up to a grand. Or I could buy an obd-2 tuner from BAMA for $400 and do it myself with a "custom" tune I download from the company. I don't have any experience in this area so any advice would be really appreciated.