Hi Team, I had bought an axle back flowmaster exhaust and installed it around an year ago. My performance has gone down and 0-60 was awful. Hence I removed it the next day and re-welded the old ones back on.
But since then car was slow not the pickup whenit was new and everything was stock.
Now I am thinking to get it checked at service and may be retune it to factory. What do you think woul dbe good option to have ford retune it with the welded stock exhaust or get a new cat back exhaust and retune it?
Please let me know, It is becoming horrible not even able to overtake a sedan cars (

Okay let me see if I am understanding you correctly.

You own an Ecoboost Mustang that you installed a cat-back on about a year ago.

You drove around for ONE DAY with it and you perceived a degradation in performance so you removed the Flowmaster exhaust and put the stock exhaust back on.

You now think there is something wrong with the car's tune so you want to take it to Ford, have it checked and possibly have Ford re-tune it.

Questions:

1. What other aftermarket performance modifications have been performed on the car?

2. Was an aftermarket "tune" ever flashed onto the stock computer?

U.M.

All that you perceived is correct. Except it was an axle back exhaust. I had cut the exhaust stock pipe and put this on.

Questions:

1. What other aftermarket performance modifications have been performed on the car?

No Other aftermarket are installed. Everything is stock.

2. Was an aftermarket "tune" ever flashed onto the stock computer?

Nope. No tunes were made.Stock as is.

Please help!!

Okay if the car is now back to stock and there was never an aftermarket tune installed I doubt Ford would try or need to re-flash the computer. If the car is still under warranty I'd take it straight away to your local Ford service department and have them check it out. In the meantime you can try this... Try disconnecting the negative battery terminal. While the negative battery cable is disconnected go ahead and press the brake pedal a couple times. This will "reset" some of the stored data the car has learned. Reconnect the negative battery cable and take it out for a spin to see if it still is displaying the same symptoms.


U.M.

Hi Uncle Meat,

Thanks for the reply.

I have had the dealer check the car. It was still under warranty but was about to expire in a month. Hence the dealer was hesitant that I came to just have a check on the car before warranty expire. However, dealership made all the checks and everything is good, he drove the car and said no issue.
I was thinking may be it was my way of driving, since I hesitate to fully raise the rpm to above 3000 or 3500 when shifting. If I was doing that it is fine.
Now I am doing a BG oil change with throttle cleaning(along with recom. evaporator cleaning). Will see if this will give any throttle response better, or else thinking of having air filter and tune.
Since I took extended warranty, thinking to go with ford performance air intake with dealer installed tune from my computer.