on a 2005 mustang gt with a auto,c&l,underdrive pullies and delete the motion plates how much differance would there be between the 87 and 93 octane program?also,how much a increase is there on a stock motor with just a tune and nothing else?

 

I'm sure there would be a significant performance difference between a 87 & 93 octane tune.

I would suggest you shoot Doug at Bamachips a email. I can HIGHLY RECOMMEND him and his tunes. :worship:

 

i recently went from a Predator 87 tune to 93 only because I seen the difference on MTAS stang on a dyno. So I ran my tank allmost empty and switched I did feel a bit more HP , but thats a Seat of my Pants feel. I dont have a dyno to prove it. I will soon be thinking on getting a new TB and new exhaust so after all that installed I will take another trip to the DYNO.
Oh and I just used the Predator canned tunes

 

Welp...my from what I can feel/tell from running at the drag strip is that it seems to have more top end power with the 93 octane tune. All I have in my '05 GT is the JLT CAI. I definately get better times at the track with the 93 tune. I'd say 2-3 tenths better.

 

My 05M dynoed at 264HP and 289TQ on a Dynojet stock without HC trap. After installing the canned 87oct Predator tune without HC trap it jumped to 279.13HP and 300.75TQ. So the total gain over factory tune with all else stock withoutHC trap was: 15 hp and12 fp of TQ. Not bad for otherwise stock and was super easy to do. It makes a difference in seat of the pants kick. I likey.