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I just ordered a set, but Im not sold on them. I do hate the rock collector. I also trust that Ford Performance engineers have that piece of aero for a reason.

Can anyone shed some light on the positive and negative effects of installing the little foam blockers?
 

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What I've read those with them like them. I suggest if you get them to take them out and let them dry when you wash car so you don't have moisture staying up against the paint for extended time. Not that it would most likely hurt any thing.
 

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I had these left over from my 2017 GT PP. They fit the GT350. Spendy for what they are, but they are so easy-peasy to install and remove, and provide significantly more protection than the foam rock blockers:

https://www.americanmuscle.com/splashguard-front-set-2015.html

I lube them with some detail spray when I install them, and clean the rubber pinch bits when I remove them to wash the car.
 

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Can anyone shed some light on the positive and negative effects of installing the little foam blockers?
I installed the blockers when the car was brand new just to keep that area of the car clean from debris & damage and they have made a huge difference and you really don't even notice they are there until you are detailing. And I've been to 150mph twice since the install and they are still there. Really easy to remove & reinstall if you were going to a car show or something. I recommend them.
 

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I had these left over from my 2017 GT PP. They fit the GT350. Spendy for what they are, but they are so easy-peasy to install and remove, and provide significantly more protection than the foam rock blockers:

https://www.americanmuscle.com/splashguard-front-set-2015.html

I lube them with some detail spray when I install them, and clean the rubber pinch bits when I remove them to wash the car.
I have these on my 2015 GT and they work great. I bought this set for the front end of my GT350. https://lmr.com/item/CPC-157363/mustang-gt350-front-rock-guard-kit-cpc-16-17. I tried the rock blockers and didn't like them so tried these and am happy with they way they look and work.
 

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I too have the foam blockers and last time I detailed my ride, I left them off to dry and forgot to reinstall for a couple of days...had pebbles and dirt there as the tires are sticky and will pull all the gravel up...cheap paint protection in my book!! Speaking of which, if you haven't yet done so, next time you're going to wash the car, sneak under the rear and check out all the collected pebbles inside the rear belly pan...just by banging on the underside of the pan, quite a bit of dirt/pebbles came falling down. I always rinse this area now (including the complete underside of the rear diffuser) out when detailing the car...
 

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Yea these! another great option. How do they look against the factory plastic? do the match the ones on the rear of the car?
Mine are the Jaeger Brothers ones I had on my '17 GT PP. They fit the GT350 (there is now one specific for it, in fact, but I already had these), and I think they look fine. Zoom in and have a look (I hope this doesn't post upside-down!).

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