Originally Posted by Vic55
For the axle back Race 102mm system, whats the hp gain?
IND ran their M5 on the Dyno with the Full downpipe back system installed.
These are the results
You will really see the effectiveness of the full system come into play if you are planning on heavily modding the car (Tune, downpipes, intake)
While the axleback system isn't designed to give you huge numbers, it will give you a much better sound.