JCW GP Rear Diffuser Secretly Available as Accessory

When MINI released the first GP any part associated with it could only be bought if you had an actual GP VIN. It was assumed this would be the case with new GP as well. But surprisingly longtime reader Karl Muller did some digging and was able to order perhaps the more interesting of all parts on the new GP – the rear diffuser. And perhaps most surprising it was not only easy but relatively cheap and simple to install.

Let’s start with the parts that make up the retro-fit:

  • 51747370213 and 51747370214 (rear brackets – 9) – about $45 each
  • 51747330559 and 51747330560 (left and right air ducts – 8) about $48 each
  • 51747330558 (air duct center – 7) about $110

The retro-fit is a fantastic way to help reduce rear lift while giving your MINI has fantastic performance look. And even better it should be compatible with the Coupe, Roadster and Convertible.

Interested? Get in touch with one of MF’s preferred MINI dealers below. And tell them we sent you.

Written By: Gabe

  • pw4

    It (or one very like it) was used on the MINI Challenge cars (at least in Australia) so it’s been around a while. I wonder if other GP2 parts (eg front suspension) can be ordered separately? The parts are on the realoem list.

    • R.Burns

      No it is totally different from Challenge parts

      • Karl

        Correct – this is a different rear diffuser. It’s an easy OEM install, and fits in perfectly with the rear JCW aero bumper, and underbody panels.

  • Jeremy

    The Cooper S Clubman has a different exhaust setup, so I doubt this would be compatible with that one.

    • walk0080

      There is no “GP Clubman”… only GP hatch.. so ya it’s not gonna fit – you are out of luck.

      • Dr Obnxs

        No, it’s just more challenging!

        • walk0080

          And hopefully someone posts a pic when it is done. Because I’m sure someone will try it eventually! :-)

  • OliverK

    If your’re looking for a full list of all the parts (which are all orderble) here it is (Sorry it’s a german thread, buts its got nearly everything covered):


  • anonymous

    Another thing that is disappointing about the GP2, it can be copied. Something the first GP didn’t get until 6 years later, not easily anyway…

    • walk0080

      Considering MINI offers “JCW” packages and customization options all over the place for just about any MINI model… I think limiting “GP” parts to only GP users was dumb. But that’s just my opinion. Either MINI should allow “JCW” and “GP” parts to all MINI owners or not. Besides there were ways of getting 1st Gen GP parts aftermarket.

      Anyways this is good news – I am not sure if I like the look, but the possible performance outcome (for track users anyways) is looking good. Taking my JCW (which is almost perfect as-is) and adding GP-like coil-over suspension and GP under aero updates is all I want.

  • mnicpt


  • Kurtster

    Now that I paid much more for it from Outmotoring, I’m kinda bummed MINI didn’t clamp down on this and make them more rare.

  • Lemelou

    Me so ****! Me love you long time! Thanks for posting this.

    • Dr Obnxs

      Quote of the day!

  • Scooter

    Here is an install thread, in English, with everything you need to know.


  • Bob Hayhurst

    It was a smart business decision to use these and other GP II parts as collision AND retro fit parts. I can easily imagine a warehouse somewhere full of parts exclusive to ’06 GP collecting dust waiting to be disposed of in whatever manner that car companies use to get rid of old parts.

    I’m not sure how much the diffuser panels contribute to lessening drag/increaseing down force without the associated belly pan and the very cool wing but I really like the look. Personally, I think the diffuser frames the rear end up nicely for larger exhaust pipes or at the least larger exhaust tips…

    • http://www.nathanielsalzman.com/ Nathaniel Salzman

      The decrease in rear lift on the GP is 90% according to MINI, and I imagine the bulk of that is the diffuser and the spoiler in combination. So even without the rest of the under car pieces, there’s a lot of potential there to actually make a difference in rear lift.

      • http://bridger.us/ Gabriel Bridger

        A fair amount is in the under tray which has been standard in most Euro markets on the R56 for years.

      • Bob Hayhurst

        It’s interesting that such a relatively inexpensive add on can be so effective. Kudo’s to the wind flow Engineers…

        • http://www.nathanielsalzman.com/ Nathaniel Salzman

          Aerodynamics is really fascinating. The low pressure area off the rear of the car plays a bigger role in drag than the shape of the front. There’s literally a suction created at the rear of the car that tries to hold the car (or any object moving through air) back.

  • Ike

    Can we just have a moment to remember I was supposed to get my GP today (March 5th), but have to wait 30 days.

  • Ike

    Can we just have a moment to remember I was supposed to get my GP today (March 5th), but have to wait 30 days.

  • Mike

    Oh, now my GP isn’t as special because 7 other people in my state found out you can order this from the dealer… Dude. Get over it. That 7 is probably more like 1. Looks cool, which they made it for the R53. At that price Id buy 2, just cause I can.

    • mike


  • b-

    At this rate one could build a GP2 Clone before the GP comes out!

  • http://www.facebook.com/tryon.lippincott Tryon Lippincott


    Or you go there and get with no hassle of the dealership

    • Kurtster

      Wow. You can order the 6-piston brakes, Brembo brake pads, GP cross-strut brace, GP Chili Red seat belts, GP rear wing, GP badges and GP decals. You really can build your own GP 2. I had no idea. I really want those seat belts for my R58 but they won’t fit. :-(

      • http://www.facebook.com/tryon.lippincott Tryon Lippincott

        Yep but, most of the stuff is just a waste of time. The 6 piston brakes would be cool but, over kill. I did think about the red seatbelts myself but there is no need for them. The diffuser and wing on the other hand my possibly be in my future.

        • http://www.nathanielsalzman.com/ Nathaniel Salzman

          Totally disagree. High performance brakes are as much a part of a complete performance package as power, suspension or aero. When I drove the GP, all that extra stopping power and feel were a big part of what made the car really special.

        • http://www.facebook.com/tryon.lippincott Tryon Lippincott

          Really, really!? The regular 4 piston JCW brake calipers are more then enough for the MINI. Adding two more is just a waste of weight, time, and money. Plus they are just 135i calipers.

        • http://www.nathanielsalzman.com/ Nathaniel Salzman

          It’s larger rotors too, not just more pistons on the calipers.

        • http://bridger.us/ Gabriel Bridger

          I’ve driven both on the track. One is clearly better. And it has six pistons.

        • walk0080

          I would rather see a back to back comparison of the JCW Brembo vs GP 135i front brakes on a track. I’ve read mixed responses online from people indicating the JCW Bembo brakes are fantastic and the odd comment that the electronic differential can cause some issues with the Brembos (when on the track).

        • walk0080

          I would rather see a back to back comparison of the JCW Brembo vs GP 135i front brakes on a track. I’ve read mixed responses online from people indicating the JCW Bembo brakes are fantastic and the odd comment that the electronic differential can cause some issues with the Brembos (when on the track).

  • GoRixter

    How about the rear spoiler?

  • Detroit Tuned

    We have placed an order for a few of the parts, so soon as you can actually get them will be stocking them. Out of stock in the US at least…www.detroittuned.com


    I’ve got a 2007 with JCW Aero Kit. Anyone know if this will work with the Aero Kit?

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