if you do an intake, h pipe, axleback and a tune and it will feel like a completely different car... about 50 horses to be had with just that both of the cars look great!!!
For those not familiar with the new 5.0 Mustangs. There has been a large number of tuned cars blowing #8 cylinder. Ford released TSB for dealer to check PCM to make sure it has never been modified if car comes in with engine problems. If found to have been modified, even if restored to stock, Ford will deny warranty. I personally would not mod a new 5.0.
only if the tuner is foolish enough to turn off the knock sensors.... then as the engine heats up the computer doesnt know when to pull timing... plenty of tuned 5.0s out there done correctly getting 22 mpg and making 410 hp to the tires with no issues whatsoever... some dealers will over look mild tuning... just make sure you are real good buddies with the dealer... but IMO too much is left on the table with the stock 5.0 to leave it as is but to each his own