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For you guys that do want to install your myride diffuser without having any gaps or buying some random strips to cover your caps I would suggest taking the route I am.
Inside the diffuser I used Lord Fusor 141 a plastic bonding adhesive, I have also placed screws around the bumper to secure the tight fit for the diffuser which I remove and fill the holes after I am finished. 3M tape will only last so long and as most members have had fitment issues with it.
Pros with taking this route
You will have perfect fitment
Cons
This is permanent (The fusor bonds the diffuser to your OEM bumper)
So unless you plan on never changing your rear or have no problems with buying a OEM bumper when you wanna change things up or part out your car do not take this route.
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I saw one of these on a IS350 at the gym the other day and it looked pretty badass. Has anybody had any experience with one of these regarding the painting and installation that is required? Any advice or previous experiences that you have and would like to share would be very helpful! I would like to put it on my 06 is350