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So you don't plan on using 91-93 octane ever? I can't imagine that you'll see more than 10hp gain from an 87 tune.

Wow, good numbers:nice:, what type dyno? Plans for future mods?

Very nice:nice:

I'm not sure on what the install price would be. Granny gear means a really low first gear that is basically used just to get something rolling or keep it rolling up a steep hill. The total MA on the auto in 1st gear with 3.73 is 15.55, traction could be a little scarce. Nice choice...

Not sure what the cost would be, but that would be a good combo. The auto gears with the 3.73 would let you run strong up to 174, however 1st gear is going to be a granny gear!

Yeah with auto is just 3.15. However, I'd have to look at the gear ratios but I'm pretty certain that the worst high speed option is the 3.73. With the 3.73 you run out of 5th around 145ish and that's basically game over.

The standard rear end for all GTs I believe is 3.31, you however have the option of getting the 3.55 or 3.73 for an additional $395, on Ford's website you can build your car, after selecting the CS (402A) in the exterior options you can select either 3.55 or 3.73. The 3.31 will do well on the...

What is sad is that people (don't know how many but at least some) believe him and followed him like naive sheep!

Looking at dyno sheets of before and after for the boss intake manifold I wouldn't expect much of a drop in e/t. Peak numbers don't mean anything, all that matters is area under the curve and the boss manifold loses power in the mid range and then gains right near red line. I'd expect the area...

I'm still bone stock, 800 miles on the odometer. Did a few spirited runs this weekend. Wow. I have the 3.55 rear end and this thing pulls to top speed without even hinting at running out of legs. Putting it over into 5th gear I expected some noticeable slowing but it ate up the...

That's not too bad, the trap speed of the second pass of 113.52 shows you are putting out more power than stock.

Well I'd wager that you aren't familiar with how to drive a manual. Unlike in your automatic civic (which probably had about 140hp) when you press the peddle it doesn't automatically down shift for you and put you in the power band. If you don't know how to put the car in the power band...

Appears that after a 255, you have to go to a 275 (no 265s I could find) and I believe a 275 requires a 9.5" wheel as opposed to a 8.5" for a 255.

After a week of searching this and other mustang forums I've gotten no closer to an "answer". I want to lower my 2012 GTCS 1", however while some say that lowering springs is all you need, others say that with just springs you will have a bad ride and wear out the stock shocks/struts...

Yeah, same here. I'm going to at least go with a 255/45 when I wear these out. Only be .4 wider but better than nothing. Shame these wheels aren't 9"+ wide...

:rlaugh: Yeah, this should be a pretty good step in that direction!

I'm in FL so from region to region probably hard to tell what a good deal might be. I got a 2012 GTCS MSRP 37,900 for 38,500 otd. I felt like I could have done better if the dealer didn't know I wanted a specific color CS and the next black one was 200 miles away... Of course the sales...

Very Nice!

Seriously! My G35 had the same width tires on the rear as the mustang but they were only 18" diameter wheels so they didn't look as skinny and it only had 300 hp! I imagine the 255 would look a little better... Someone has to have 255s on 19s on a mustang out there they can post some...

Thanks JKidd, That's basically what I've been doing so far, just not running any length of time at one rpm. Haven't wrapped it past about 5.5k yet either. Figure I'll get a little more aggressive as I go! :flag: