Ordered it from JBSpeed. As always, great service and quick shipping. Took a little over a week.
Quality is a little hit and miss on other parts I have ordered from them, nothing too bad, and worth the money for sure. The diffuser was pretty good. The only issue I had was on the right side, where it wraps down around the tips. The curve is a little off. Nothing I couldn't deal with though. Other than that, the quality is very good. From what I can tell, the part is fiberglass with a carbon fiber overlay on the side you see. Came packaged well and no damage when I received it. Pretty light too.

On to the install...So I pulled the plastic trim off of the bumper using a heat gun and a plastic scraper. Found that from searching on here. Took about 10 minutes. Don't plan on keeping it. It came off in pieces... even though I tried to salvage it. Removed all the two sided tape and cleaned the bumper with some prep solvent, to remove any oil and wax.

I fastened the diffuser from behind with ten #10 stainless sheet metal screws, 5/8" long. I drilled the holes in the bumper slightly larger than the screw diameter. Three across the top, three across the bottom, and two on either end, where it wraps down around the side. I put the diffuser up against the bumper and got it aligned where I wanted it, then marked one of the holes with a marker, from the back. I drilled the marked hole in the diffuser with a drill slightly smaller that the #10 screws I was using, and test fit it. Once I liked the location, I installed that one screw and then worked to mark the rest of the holes, then drilled them.

After I had all the holes drilled in the diffuser, I used a black polyurethane sealant as an adhesive. It is made for roofing applications for flashing and shingles. Flexible and good in the weather. Installed the screws and that was it.
Pretty straighforward, just take your time and "measure twice, drill once".

Unless someone rear ends me, it's not going anywhere. Total install took about 2 hours. Should have taken pics along the way, forgot.

I like the look a lot, plus it frames in the tips and helps with how they were sticking out more than I liked.

Bill

 

Looks good!

 

Looks good! Do you recall the name of the black polyurethane sealant you used?

 

Thanks. It's made by DAP, Premium Roof and Flashing Sealant.

 

Nice tips! Looks very aggressive

 

Looks ok, Kinda bulky, The Euro Teck ones slid in perfect..

 

looks good - is it just me or is the right side tip a bit off?

 

A little. I fixed that today. It actually got worse after I drove it and everything settled. I had to tweak the hangers on both mufflers to get it perfect.

 

what wheels are you running? post a pic or 2

 

I believe they are Avant Garde M333, which I think is a CL rep wheel.
They came on the car. Link HERE.

 

the pics are dead