Quote:
Originally Posted by nikitopo
I have several logs on my car with the stock muffler and a few more with the STI muffler. In all the logs the maximum power appears after the change to be always 200-300 rpm higher, meaning that the engine breaths a bit better. So, the statement that there is a 13% lower airflow resistance looks to be true and measurable. I would say that this could be translated to a 2-3 bhp improvement at top end, but it is difficult to notice in daily driving. I haven't seen any other change in performance.
|
I thought something like that would be the maximum, I have heard catback exhausts give around 5hp on a twin. But yeah I don’t really notice it at all. I found a bigger difference in response by putting the lighter forged alloy wheels on.