Originally Posted by GTechR
I've just started selling a new Brand from the States called Aero Exhaust, they are used on NASCAR, they are designed with noise limits in mind...
What there website says...
Aero Performance Exhaust is the world leader in performance exhaust airflow technology. The company spent over three years in Research and Design to develop the new Aero Performance Exhaust Muffler technology.
When the incoming exhaust air stream enters the Aero Performance Exhaust it is rapidly expanded and split via an airfoil cone with an orifice similar to a jet engine. The outer air stream accelerates as it recombines with the inner air stream. The recombining of the air streams muffles the exhaust sound and increases the exhaust flow. Thus allowing your engine to breathe easier and dramatically increases your vehicles performance.
The Turbine series as well as the Turbine XL series allows for more efficient combustion to create added power instead of simply dumping more fuel into your engine. Aero Performance Exhaust achieves incredible performance and improved gas mileage while creating the smoothest low throaty turbo sound on the market.
Most vehicles have extreme restrictions on exhaust airflow, which increases exhaust temperatures and decreases engine longevity. The Aero Performance Exhaust breakthrough, based on thermodynamics and jet engine technology, dramatically reduces the exhaust backpressure, leading to:
Reduced Temperatures
Increased Horsepower
Increased Torque
Increased Fuel Economy
Less Engine Wear & Tear
They are currently being sold in the UK in component form so I can supply pretty much supply everything you need to build your own system.
http://www.aeroexhaust.co.uk/where_to_buy.html
Id be VERY wary of US performance silencers. Unlike UK ones, VERY few, esp ones designed for n/a V8s, are straight through, far far from it.
So suck for turbo cars.