There are a TON of tire & wheel threads, but I have specific requirements that I am struggling with. Yes I am asking for a lot.

Wheels:
18's
At least 9.5 width
Fit bigger brakes (Brembo's?)
Not "Replica's" (Not Bullits/FR500s/GT4s/etc)
Low end of price spectrum

Right now that's GT500 take-offs, any other options?

Tires
Matched tire Brand & Model...Similar to 255/40/18 & 295/40/18's (rear being the main concern, can adjust front wider/taller)
Not drag radials, want all around performance (cornering)

Current are Falken Azeni's RT615's, not against them but want all options.

 

Rota makes a wheel along what you're looking for. I believe it's the P48. Comes in 18x9.5 fitment, 38mm backspace. You can get it in standard silver, anthracite, and two shades of bronze. Black as well.

The wheels should come in around 900 for the set. More expensive than replicas of course, but far off from a wheel like an iForged, Bonspeed, CCW etc.

The RT615 is a great tire. You might also look at the new Nitto NT05 for your rubbers.

with cornering your main concern I'd go with a 285 at all four corners. The NT05 in a 285/30 fitment would be my choice. You get some gear out of the swap as well which is gonna help with acceleration as well.

 

Hmm P45's.. don't think I've ever seen them on a Mustang, interesting.

As far as tires I really want the rear as close as possible to the current 295/40's.. I like the tall sidewall look.

 

You may get a tiny bit of rub on full lock, but you shouldn't have too much fuss putting that 295 up front as well.

You'll lose a little bit of turn-in response, but gain a lot of grip through the corner. Especially with a tire like the RT615.

Obviously you could stagger the tire section width, but if cornering is your concern I wouldn't. Unless you also want to start messing with sway bar stiffness to counteract the understeer that is going to be introduced by having more rubber out back.

I am of course assuming here we're talking about a track situation. If you're just doing some spirited driving in the mountains or something similar, it's probably not an issue at all.

I do know Sam Strano had posted that he had a 295/30 up front on an 8.5" wheel for his race setup.

 

Steeda has lots of wheels that meet your requirements. I have pentars and I love them.

 

I'd be concerned about tire rubbing on 295s. Lowered with ultralites I get some rubbing with Falken FK452s 275/40/18 on all 4 corners. I'm swapping out the fronts for 255s since I'm tired of the rubbing in parking lots and how bad the steering tracks on bumpy roads.

 

this may be the case, but taking into account what appears to be a serious concern for handling by the OP, a 295 up front, with a little bit of inconsequential rub at full lock, makes sense.

These cars have a fair amount of understeer to begin with. As you increase the section width out back disproportionate from the front, you start introducing more understeer.

Now again if this is only a street driven car, and it's not tracked, that's probably not too much of a concern. However, the advantages of having a matched set of tires to keep the handling as neutral as possible is worth some trade-offs.

Like, a bit of scuff in parking lots for instance.

 

Street car, 295's would be too much on the front... I have 255's, may consider 275's but I already have tracking problems (it's the road(s) but is more pronounced in the stang).

 

Look at the shelby wheels cs 69s are 9.5 wide with 45mm offset. 285/40/18 are same height as 255/45/18 . Around 27", same as stock. Buy wheels today has them for a little over $200. per wheel

 

Yes I've always liked those, but I *think* it's only the 20's with a decent lip/dish on them... anybody have pics of the 18's closeup?

 

What ever you do, dont go wider than a 285 or narrower than a 245 on your 18 x 9.5s with an aspect ratio in the 35 to 45 range and keep the tire diameter around 27" and the load rating around 97 or higher.