Quote:
Originally Posted by The Radium King
I've thought about the 'parachute' effect when the oem muffler was replaced with a smaller aftermarket muffler, and how you could vent the rear bumper cover to avoid it. also thought about adding something like this that would run from the transmission pan to the rear bumper cover (trim the cover so that the diffuser came just under the licence plate) - one on each side of the exhaust outlet:
 Universal Rear Diffuser Kit Under Body Spoiler Increased Down Force Reduce Drag | eBay |
That looks like a good price for what it is but I doubt it will have enough positive effect to offset it's weight (if you care). Seems perfect for a civic or BRZ. I've thought about splitting the exhaust as well and building a deep diffuser up to the height of the bumper but really don't understand how they work- it's got to earn it's keep on my car. I've wondered if I could trade a diffuser for a wing on a track car to decrease overall drag while sucking the rear down...Porsche did real aero and anytime we let airflow in somewhere
we risk adding drag and/or increasing lift.