PART NUMBER: 61-2021
OUT OF STOCK
The unit is adjustable vertically to fit multiple aftermarket exhausts. Produced from aluminum, the unit can take quite a beating and still retain it's functionality and shape.
FITMENT NOTES: Fits with all of our RoadsterSport muffler options EXCEPT the Twin Tip Super Street. To fit this diffuser with the TTSS, you will need to add longer hardware with additional spacers to space the diffuser down enough to clear that muffler.
Durable black powder coat
Stainless hardware throughout
All brackets/hardware included for a full install
Flat head riveted strakes (No rivet heads visible, flat bottom)
Simple Bolt on installation, no cutting required
Significantly reduces lift
I emailed GWR about inventory and got a response within minutes. Placed the order and it was shipped the same day and arrived in just a couple days. This part speaks for itself, it's subtle and aggressive at the same time. Installation was easy in the beginning but quickly became difficult when I realized I didn't have paper-thin hands and arms. Definitely recommend using a lift (save your back, I didn't) and have a friend help. Overall I bought it for the looks and it does not disappoint. 10/10
I was excited to see that it was back in stock since I had been wanting to install one for a while. I had a friend with a shop and a lift so it was a very easy process to install. I have only had the car out on the street, so no comparison of lap times with or without the diffuser... but at highway speeds it seems that the airflow allows for better acceleration ...and it looks great.
I have always had a love affair with how rear diffusers look on cars but this one performs as good as it looks and gives my car an "all business" look. Of note the front brackets are redesigned from the diffuser in the instructions so don't think you are missing parts. They went from a single bolt to dual bolt setup it appears to further hold this diffuser on better. You also get plenty of room for adjustments and more than enough spacers. I used the largest spacers on the rear and the smallest on the rear-most side bolts and it is adjusted to the recommended specs but you can tune it for your track needs. I put a Roadster Sport axle-back on my car and this diffuser has plenty of room and also closes off the massive cavity left that the stock briefcase muffler took up since the Roadster Sport is leaps and bounds smaller, lighter and better than stock. It's pricey but you pay for quality that works which is something you wouldn't find on a eBay cheapy-ABS plastic unit that I see so many people running on their cars as I believe they are in the "all show" club. This diffuser is beautiful, light weight (I think the box it came in weighs more), thick powder coating, stainless hardware (and plenty of extra hardware) and installs in about half an hour (need a hex wrench, a 10mm and a 12 mm socket) on jack stands. Solid must buy for aero geeks like me!
Very happy with this diffuser, more than expected. I'd seen one at the track and thought it looked kind of flimsy, but man oh man this is a nice piece. Excellent instructions, if I recall I supplemented some of the hardware because I'm a bit OCD on that kind of thing. "Seat of the pants testing" it feels like it does indeed work, the car certainly seems to move around underneath me much less than before (80MPH or so and up). Track Day on August 6th will tell me more, but if nothing else it definitely closes off the "parachute" formed by the bumper facia, and it looks just cool as Hades. Summary: Dude, I'm stoked! I dropped some pics in the Gallery if you want to look.
Pretty straightforward install and fitment is good. I did it myself but an extra set of hands would make it easier. You will have left over fasteners when you are done. I used the largest nylon spacers in the back. I didn't need to in order to clear my Roadstersport race muffler, but wanted to get the diffuser as low as possible. No vibration or contact with the muffler. It definitely makes the back of the car look better, which is why I bought it. I can't comment on improved aero as I don't track my car. But based on my racing experience, it looks like it should generate legitimate downforce. It's a little pricey but it looks good, much better than a wing.