I was just wondering will a 315/35/20 fit on my 2010 mustang gt without any problems I'm thinking about lowering it with a sr performance 1.5 all around or a cobra jet drag spring 1.75 in front and a 1 in the rear

 

Maybe, but I doubt it, that is really pushing the envelope . . . . the right wheels will be key, if I was seriously going to attempt that I would talk to Vorschlag and you probably need to buy their "custom" wheels. Check their web site to get some clues.

Why that size; what are you trying to do? For drag racing there are probably better choices.

 

That's a tall and wide tire.
Yes it will fit, but you'll need an 11"-wide rear wheel with offset of 56-59mm.
And you might need to remove the shock boot for clearance.
And you'll definitely need an adjustable panhard bar to center the rear axle.
What size are you considering for the front?

 

Dang that's kinda a bummer I kinda was going for the look love how they sit. What is the widest I can run on the back? I'm going to buy rims for the back just don't know the size yet what ever the widest I can run with a little meat

 

If you're lowered or planning on it, you'll need an adjustable panhard bar to center the rear axle.
That way those big meats you want back there will both fit inside the fenders and you won't have one sticking an inch outside the fender while the other one is an inch inside it, lol.

What is the car, what size wheels are you looking at, what power are you putting down, and why the need for "the biggest I can run"? Is it just for the look, or do you NEED a sticky wide tire because of how much power you have?

 

The folks at Vorschlag are the best resources I know to answer this question. They have worked on this extensively for Mustang road track cars and they know all the fitment details and any modifications needed to push the envelope. They can also sell you the exact wheels needed to do it, and from what I have seen their prices are competitive, for Forgestar wheels which are mid-priced wheels. (meaning not super cheap like the ones you will find on American Muscle).

 

I have a 2010 mustang gt with a cold are intake and that's about it soon ima get cans for it I just wanted to get the rims out of the way I was looking maybe around 600hp ima try n build it to buy it's more of a cruising car but when I need to I can mess around that's why I was asking for the best set up for the back I like how 315 or 305s look on the rear

 

Well, there are a lot more choices in the 305/35/20 size, and they're a bit easier to fit.
Perfect fitment would require a 10.5-11" wide wheel, but they'll mount up just fine on a 10"-wide wheel. You just won't get the full benefit of having a 305 since sidewall bulge will shrink the contact patch to about 285.

600 rear-wheel-hp from a 4.6 is asking a lot and would require a bottom-end buildup.

 

I was thinking about doing a coyote swap I'm sorry for got to mencine that lol yea or like you said doing a full build but that's my goals I just been curious about the rear about rubbing, fitment and sticking out

 

275 or 285 is the most common "wide" size for these cars; those can be accomodated with the right wheels with no real issues; beyond that you need to start getting very careful

Coyote swap is a lot more involved than you probably realize, it's not just the engine but all the controls that go with it

Start reading up on superchargers, and I suggest you shoot for about 450 HP first and see how that works for you. That can be done relatively easily with a supercharger. Beyond that it gets a lot more involved.

"Department of Boost" is a great source for supercharger information and also a kit for your car:
http://www.departmentofboost.com/

Sounds like you have a lot to learn; lots of threads on here and other forums on these topics to give you plenty to read.

 

Sell the 2010 and buy a Coyote car if you want a Coyote.
If you swap the '10 you'll be left spending huge money on a 2010 GT that will just be a mongrel ... still a '10 GT but with lots of mods that will most likely keep possible buyers away when you decide to sell.
And we all say we'll keep them forever, but "that time" always comes and we want to sell or trade up.
If you think you want even more than 600 HP, save your money and get a Shelby.

 

There's a fine line between "mongrel" and "unique one of a kind" LOL

Yes agreed -- I love my 2010 but I would look hard at trading it in before I dumped any serious money into it. Actually I think about that almost every day . . . right now I am planning on some minor tweaks and upgrades but if I was going to spend $5K or more I would be looking at trading it in.

Back to the Demonic, if you want a fun project with lots of do-it-yourself work and a unique car when you're done, then by all means mod the 2010. Just don't fool yourself to think it is an "investment," it's really an expensive hobby.

My advice would be to look at the Department of Boost manifold as a reasonable cost and major power upgrade that will get you to about 450 HP. If you really think you "need" more than that, look at trading the 2010.

 

I have about 10 grand into my Whipple setup, and these days I really wish I never did it and that I just traded in the car for a GT500.

 

Gabe, you have the best of both worlds with your 13 whipple Coyote and your wife's 08 GT500. Therefore there wouldn't be a need for trading in your 13 GT anyhow