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Open my car up without getting sc or turbo I got flowmaster 40's exhaust and bbk cai

Also what helps with throttle responce i hate waiting for my car to go when i puinch it I'm an automatic

 

get a tune for it, i recommend bama chips

 

that prob what i gonna do just seeing if there anything else worth doing before the tune

 

Since you already have the cai and exhaust its now time to GET A TUNE!! The tune will make a lot of difference in how the V6 automatic Mustang runs. VMP or bama are the way to go. Gears & T-lok should be next on your list. You should also look into an aluminum driveshaft as you have an 05, no lock rings on the universal joints.

 

There is no secret to unlocking these cars, you've been around long enough and heard enough stories about how a TUNE will make a night and day difference.
Gears work well, so do many other things mentioned. I'd really look into LCA's as well, its a $100 bolt on that will make a difference as well.
You'll get all the throttle response you need when you tune it!!!!