I verified today that the GP2 indeed does come with the front under panel that I mentioned earlier in this thread.

Here's a pic I took.

 

Thanks Andrew We need this piece, any chance of your dealer getting a part number?


-Steven

 

I was just looking at the photo you posted, the exhaust is new. Is that a second cat I'm seeing? Something new with the N18?


-Steven

 

Yes!. Please be for sale. Any and all vendors should start working on this.

 

I noticed that to Steven. It looked like 2 resonators to me but I could be wrong. No one seemed to know, lol, go figure. The only reason I leaned toward two resonators was that it looks like the rearward most resonator in the pic looks shorter than our stock JCW resonators. Maybe I'm wrong as I haven't looked at one for a year or so (mines gone). I meant to get measurements of the total exhaust too to see if it was actually something like 2.5" or the same diameter as the stock JCW.

As for a part number. We looked everywhere we could minus taking the underpanel off and couldn't find one. The dealer is looking into it though. So far he's found no clue.

 

Yeah, it does look more like a resonator. Thanks for the work on the part number, keep us posted.


-Steven

 

The exhaust is very close to the one that came on my 2013 MCS roadster. It's on my deck and just took a look.

 

Thanks J, it must be part of the N18 package.


-Steven

 

We took Algy with his new diffuser out to the track (Laguna Seca) on Tuesday. The photographer seemed to be trying to get a look at the diffuser. He's never taken pictures of the "Corkscrew" from this angle before.

I don't know if the diffuser made any difference, my wife's lap time improved by 2 seconds, but I couldn't get within 2 seconds of my best.

 

That's a great pic. Really give you a feel for the elevation change.

And the diffuser looks sweet too!

 

Ok broke down and ordered last night! This forum is so bad for my wallet!

 

Just installed it. Holy heck. It was pretty hard... I have some tips though. I'll share it after I get some relaxing in. Took me 3 hours... Looks great though.

 

Here's a pix.

 

Looks great! I should be receiving mine in the next week or so. What was the hardest part of installing?

 

The two sideways screws that holds the original "diffuser" and also snapping the GP diffuser into place. I'll do a write up on the hard parts later tonight.

 

InVisibol looking forward to your write up. I have the same jcw as you and am wondering how some only took an hour and you said 3. By the way looks real nice!

 

Same here as I've already ordered the parts. =)

 

Okay. So here are some of my thoughts regarding the installation. There were (2) things that were difficult, but after a bunch of trial and error, I was able to figure out the best way to go about it.

1) There are two screws that attach the "old" diffuser to the bumper. They are on either side (driver & passenger). It's sideways and really tucked in.

Here's the "interior view" of the location of one of the screws. It is the one on the driver side:



That zig-zag line that I drew in is where your screwdriver would need to be inserted. But there's literally no room to fit any normal sized screwdriver. So if you can't, you want to have more space to work with. So what I did was take off this small plastic piece right below the bumper. It is held on with (2) tabs. It pops on and off quite easily:





Here's a photo of where that piece is located (and you can faintly see my 1/8" hex bit near the red line):



After taking off that piece on either side, you will have room for your hand to work with the 1/8" hex bit. Because I didn't have that small of a screwdriver, I used a nose plier and twisted it until it loosened up. Then I was able to just use that 1/8" hex to hand twist it off.

Here's another view from the other side of the screw:



Remember, you will have to put this screw back into the same place on your new GP diffuser.

2) It's very hard to snap the new GP diffuser into place. There are these tabs that need to snap in but as you push in, your whole Aero bumper flexes so you can't get much leverage. The best way to go about this is have one hand to push your diffuser in and use your other hand to reach back to hold your bumper in place.

Here's a view of where your fingers should push back on the "inside" to create the counteracting force (you can see (3) tabs in this photo):



Hope that helps along with Scooter's write up.

 

I don't know. Having dealt with installing the challenge front splitter, installing the rear diffuser wasn't that hard. Everything lined up pretty easily and I didn't have any issues.

 

Those are the trim bit I mentioned, making it easier when you take them off. To undo the screw I used a torx bit in a socket wrench. The socket wrench doesn't quite fit, but the bit is long and I was using a 1/4-3/8 adapter as well so it went into the screw head at a reasonable angle.

 

Let me know what trouble you had with installing the front Challenge splitter? Maybe a new thread?

 

Went to the NY autshow yesterday to see amongst other things, the GP2. First of all....it gets a big mehhh from me. Secondly, the diffuser they had on the car was popping out of the snaps on the right side. It's not just us.

 

No worries, it got easier to take on and off over the time I had it. It was the initial install which was the hardest because of how long the base was. Definitely needed an extra hand to push the bottom of the bumper while you tried to get the clips to snap into place. Good thing I had the bumper off at that time when I was getting it installed

 

Concerning those two screws that hold the diffuser panel to the sides of the bumper I just removed the small aft fender sections which made removing the stock diffuser and mounting the GP diffuser a snap.

 

I just installed mine.. Was super easy and looks great.. I'm getting .5 mpg more with all the aerodynamics of the JCW kit, wing, and diffuser.. At high speeds, I can feel the down force and extra contoll.. AWESOME!!!!