Would just these 3 mods be worth it?

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2015 CX-5 Grand Touring AWD w/ Mazda3 18 rims
I wasn't sure whether to post here or the lounge.

1) Rear sway bar - Corksport
2) Strut tower bar - Ultra Racing (also will this bar fit on a 2.5L with AWD?)
3) Front Sway Bar - James Barone Racing
 
All will fit your car. All will improve cornering. However the sway bars will outperform the stock tires.
 
I would try the rear sway bar only first; for most this will be a huge enough cornering improvement. I wouldn't add the front sway bar on stock tires. At that poit the capabilities of your suspension will out perform the grip of your tires; not even worth it. If you get a wider wheel and tire or wider tire/stickier compound then you can utilize the improve cornering better. In fact simply changing the wheel and tire can result in a very tangible handling increase. The rear sway bar is the most tangible increase, the front sway bar is tangible, however replacing the stock FSB with an aftermarket FSB is not as significant a change as swapping the RSB. I probably wouldn't touch the FSB on a CX-5 with stock ride height. It might introduce some undesirable over steer with the soft suspension and it's travel. On our car, the strut tower bar isn't very tangible but it's good for reducing flex between the towers during cornering. Which means for a "sporty/hard" driver less metal fatigue over time and less alignment change during hard cornering. The AWD itself helps a lot maintaining grip, maximizing the cornering performance of these mods compared to the same mods on a wrong wheel drive cx-5. I don't know if you just got your cx-5 or are just new here, but the best way to get the rear engaged when you want (or need) it is to downshift. Particularly in high speed sharp corners where you can tell the difference between going through in 5th or 6th, and 3rd or 4th.
 
Thanks I'm coming from a couple Ford Contours (not SVT) and a Jeep Liberty. Jeep was fun but my fuel mileage is close to double. We always had Mopar growing up and my Dad drove those eccentric 2 cycle Saabs as work cars before they got expensive. I'm at the age where I really appreciate tech package headlights. Anyways I just wanted to say Thanks and sorry for rambling! LoL
 
Always buy a matched set of Stabilizer Bars from the same manufacturer. The relative stiffness of the front to rear needs to be matched to the car and even the springs in the suspension. Mixing and matching from different manufacturers takes a *very* experienced hand and isn't likely to turn out well.

My 2015 GT has a factory strut tower brace. If yours doesn't, that should be your most effective (best engineered) bang for your bucks.
 
Doesn't matter that the bars are "matched" or not. That's subjective, and the bars are adjustable so you can set what YOU like for over/understeer. Different companies sell different sized bar sets and both bars you listed are adjustable. Most people only change the rear sway (you can look around many forums including autox to find this), leaving you with a "mis match" as it is.
 
I wasn't sure whether to post here or the lounge.

1) Rear sway bar - Corksport
2) Strut tower bar - Ultra Racing (also will this bar fit on a 2.5L with AWD?)
3) Front Sway Bar - James Barone Racing

The strut tower brace is a great mod on a car with a flexible (weak) chassis and can really improve corning grip and precision. But the CX-5 chassis won't benefit significantly because the strut towers have minimal displacement, even under hard cornering. This is because they are well integrated into the chassis and located close to the firewall for additional rigidity. In addition, they already have a lightweight strut brace (which supports the cowl) that resists the spreading tendency of the struts under hard cornering.

IMO, adding further support is just unnecessary weight on the front wheels without a significant benefit.
 
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