2006 Lotus Elise
"The car definitely feels more solid above 50 mph. It is now a completely different car, in a good way. You do nice work and your service matches." - John, Hawthorne CA.

2005 Lotus Elise
"I got my Railer yesterday, it installed like the stock dif and had it on in about 10 mins. I have my Ohlin's set fairly soft due to the back roads that I run on. I can feel the car being sucked down at around 90 mph. I normally only go to 120+ on nice roads, but I thought I would try it and got up to 129 on a bouncey back road with complete confidence compared to without it." - Darrin, Piqua OH.


What's so Special about our Diffusers?
Our diffusers are designed to improve the overall performance and look of your car. Most of our diffusers don't require drilling or cutting. Just bolt the diffuser on to the car and you're done.

Increased Stability at High Speeds.
Our diffusers have a long body and long fins. A long body helps keep the air under the car, as opposed to swirling up behind the rear of the car. The long fins help channel the air straight out the rear of the car, as opposed to having the air scattered underneath the car. Check out our Demonstration Video.

More Downforce and Less Drag.
The fins on our diffusers are vertically angled to 90° degrees to prevent ''air spill.'' The long fins keep the air channeledsmoothly underneath the car so it doesn't flow in any direction except front-to-back. When you have the air flow under control, you'll get less drag in return. Less drag means a higher top speed, better stability and an increase in gas mileage.

Why can't I just get a Carbon Fiber Diffuser?
Usually the diffuser sits right up next to the exhaust system on a car. Some carbon fiber finishes can come off easily. Our aluminum diffusers with a black powdercoat won't warp or discolor like carbon fiber. Our diffusers can also handle harsh scratches and scrapes from the pavement. Carbon Fiber diffusers can crack and they are expensive to replace.

Quality Workmanship and Finish.
We design, waterjet, assemble, powdercoat, package and ship our diffusers here in Missoula, Montana USA. Handbuilt to perfection, we guarantee it or your money back.

Check out what people are saying about our diffusers!


Different Colors and Tastes... Our Diffusers on Customer Cars!
We can also make custom diffusers for your car!