So this year I bought a 2012 Mustang 3.7 liter manual with a bunch of performance mods already done.…

MustangMike

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.

Comments (3)
No. 1-2
Scotty Kilmer
Scotty Kilmer

Editor

exhaust leak can't damage a maf sensor. they can be cleaned. But with that highly modded car, I would advise paying a mechanic to check it out first for just about everything, like what type of cam is now has and if software changes have been done

MustangMike
MustangMike

My second question would be about mass air flow sensors. Would an exhaust leak damage one and can they be fixed by perhaps soaking it in isopropyl alcohol?