Quote (FMX_89 @ Nov 7 2013 05:25pm)

Mustangs are about the only modern cars I've seen that need a tune with an intake.  It's probably because the factory intake is restrictive and all of the aftermarket ones are GIGANTIC.  Mustang guys always want a 235025mm intake tube and 2134509123mm MAF with a 1235607969mm TB.  Big diameter = low velocity, which usually causes turbulent airflow.  That messes with MAF readings.  Big TB's also give you tip in throttle problems which present themselves as surging and poor low throttle percentage modulation.  Anything over 90mm usually starts to give you problems on a monoblade.  It's just how the mustang aftermarket has developed.


Anything with a MAF and an intake that isn't a big restriction being replaced by something not drastically different in size won't need a tune.  That is what the MAF and MAP combo does.  The difference in vacuum and air density at sea level from stock intake and a CAI is far, far less than the difference in a stock intake at sea level and a stock intake at 10,000ft elevation.  The computer adjusts for that just fine as it can with the CAI UNLESS you introduce something that causes turbulent flow over the MAF.

If it is SD I would get it tuned just to be safe.  98% of the time it would be fine but if you were operating in a fringe situation already it might bump you over the edge.

Quote (iRTB @ Nov 7 2013 05:42pm)

The only thing that I think is restricting on the new mustangs is their filter. Intake tube looks pretty good. Just my opinion. I've read reviews about people ISO an aftermarket heat shield that lets in water.