BRZ Rear Diffuser
 

When building a BRZ for fun on the Subaru site there is a rear diffuser available for $750. It doesn't look like much, but besides getting some extra downforce on a track day (if it even provides any) is this worth considering for a daily driver? My understanding is that it wouldn't provide any extra benefit since it only assist with downforce at speed... :thanks:

To each his own. I ordered one mostly because I liked the visual more than anything. "Lots" of WRB on order!

It should help clean up the airflow going out the rear of the car. Unfortunately the rest of the underbody looks pretty turbulent. I think the JDM cars get some sort of smooth underbody panels but because of the US-market exhaust they eliminated it... How stupid!

I'm pretty much getting one for looks; I won't lie. It makes the arse-end look a lot more "finished"

http://www.rallyxd.com/rallyxd/wp-co...i-package5.jpg

I'm not convinced it's useful in any way (not real diffusers in general, this specific piece), so no.

Understood... :thumbup: That one in the picture you posted looks more pleasing to the eye. I guess that begs another question if this thing is going to be painted to match or just plastic because if so it will look like they put an asstache to match the front.

This. X1000. I think this car looks fantastic in stock trim. I refuse to throw anything on the body unless there is a clear, demonstrable advantage in performance over the stock configuration. The car has an impressive 0.27 Cd from the factory (with rear deck lid aero trim piece). I am loathe to ruin that Cd over what could potentially be a $750 appliqué component that does jack-shit.

PS: it looks idiotic with the US spec. exhaust tips.

Rear Underskirt video
 

That's a walk around with about 3 seconds of rear diffuser action. We need to see the underbody, not the ass.

I ordered one for my SWP, but mainly just for that little bit of finished look to it. I agree it looks bad with the standard US exhaust tips, but I am already on planning on getting the HKS Legamax Premium exhaust with the much larger tips. Hopefully it helps to just make a better looking rear end and sets it apart from some of the other SWP out there. Although, I am also getting dark tints and black wheels, so that should help too.

I think plasti dip spray would be the better option
On the wheels.

It's likely this accessory won't provide any real value to a street car from a performance standpoint.

Furthermore I personally don't think it lends itself to making the car look better. Maybe it looks better in person, but based on the video and the pictures I frankly think it looks exactly like what it is, a piece of hastily tacked on trim.

If you like it more power to you. As for me, no thanks.

It won't for a track car either. This part I mean. It doesn't look effective from what we can see and if it were an effective piece there'd be more pics to show it. It's a body kit item, nothing more.

When I posed this question I was hoping you'd answer this Dave! Cheers! :happy0180:

Who makes the gas cap?

It's an OEM accessory and an $$ part.

By itself, I wouldn't be surprised if it was all cosmetic. It may only become functional once you complete the rest of the aerodynamics; front, skirts and undercarriage diffusers.

Why not wait for an aftermarket unit that will have the same build quality but a lower price.

You guys are nuts to pay $750 for that thing from the factory.

Give it a couple months and you'll see 10 different aftermarket companies selling them on ebay for $200 shipped or less.


I agree that it looks pretty sharp, and I think i'd like to have one on my car at some point.. but not for $750.. holy crap!:bonk:

Subaru makes that. But I believe it's just an applique, not an actual cap replacement.

Judging from your post title, I'm afraid to click that link....

"Rear Underskirt video"

Just doesn't sound quite kosher...

would look sick with the USA TRD exhaust tips

As was said in previous threads, cover up the rear suspension components before thinking about underbody aero pieces.

I'm kind of a fan of how it looks...I don't think any aerodynamic benefit would be noticeable for a daily driver.

I didn't get it but figure I can later - looks to be a simple bolt on.

^ :word:

There was another metal type defuser (ok air channeler ;)) for the BRZ/FRS that's available too. I'd rather pay for that one than this one. I highly doubt any of these aero stuff are actually effective, but hey to each his/her own.

the Subaru rear diffuser thing is just for aesthetics/cosmetics. I think the reason price is set so high so it would steer copycats away from buying it to replicate for reaping profits.

Just like STi V-limited front lips for WRX/STi back in the early days (2004~07).. They were going for $500+ when exchange rates Japanese Yen to U.S dollars were good..

Why would pricing it higher prevent copycats? Subaru overcharging just means that the copycats can charge more for a knockoff while still undercutting Subaru.

I was thinking the same thing. Copycats in China routinely buy Rolex's to copy them. The price of authentic rolex's don't stop them. Do you really think a couple hundred bucks will stop them? I say it's just Subaru trying to rip off their customers as best they can period.

I like the back of the car better without it. But...........it ain't my money!

It doesn't. On my 02 WRX, the STI V2 front lip cost $750 USD, ended up picking it up and a few months later there are all replicas out. The only difference though is that most replicas became single piece whereas the STI V2 still was two piece with a middle joint covered by an "authentic" STI sticker. :lol::lol:

It's normal for factory aero parts to charge that much for pieces anyways.

+1

Looks clean without it.

Will not get it. I would rather spend 750 on bolt ons or a set of tires.

I'm hoping my friend can get it for me for cost+10% or something. Probably still $450 but... leave me alone, I like factory aero!

Now where's the STi front splitter?

It basically looks like the R205 STi diffuser for the GRB. And the situation is same on that car, the underbody is so un-aerodynamic I doubt it does much. They do look pretty cool though.

I think it looks decent on the car, but not $750 worth of decent. I'd rather spend the money towards wheels.

I agree, why spend $750 on an unpainted body part? The aftermarket will have them real cheap. Plus you should get a better exhaust first.

The gaping wide rear diffuser openings make the stock chrome-tipped pipes look too small/out of place. Larger diameter tips would fill it out nicely; I'd get the rear diffuser only to complement an aftermarket exhaust.

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Believe me, it won't be my first mod. Wheels and suspension, then exhaust, then aero. I wanna get that TRD duckbill spoiler to replace the OEM one; I think it looks a lot cleaner.

Probably all for looks... I've never been a fan of the Varis/Voltex style "under diffuser panel" either (what they're calling a "Diffuser" here) which have been available for other models of car aftermarket for some time now... The diffuser is the gigantic dark integrated part of the bumper that comes stock on all BRZ/FR-S and it looks fine by itself

^^^ This! I liked the way it looked in the JDM brochure that was posted earlier and i was planning on getting it, but after seeing the video it looks strange IMO. With larger diameter tips it would probably look much nicer!

Plus, $750 is a lot for that, i would rather get winter tires with that money.

I honestly didnt even know what it was going to look like when I added it to my pre-order, but I'm happy I did. I get why people think $750 is too much, but personally this car is below my price point so I thought what the hell. And within 6 months of delivery I'll have new exhaust on it to fill up that gaping space so it should look pretty clean. Especially with the black 18's it'll be sitting on.

Looks nice but I wouldn't waste my money on it, rather get some power mods for that kind of money. A nice greedy exhaust will fill the area nicely:D

The rear diffuser came already equiped on my BRZ limited.
It is for looks only. It's just textured matte black plastic that is bolted on.
It flexes when you wipe it with a cloth. It's not going to produce any downforce...just looks cool. I'm going to order the STI front lip and sides as soon as they are available in USA.

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