Originally Posted by ZeroZeta

Hi JaykeZ. I am running muffler delete with HFC and can say this.

1. It is incredibly loud - test pipes will be even louder.
2. I enjoyed having a pointlessly loud car that could mess up my hearing above 3500 rpm.
3. The glee I got from the loudness lasted around 1-1.5 years.
4. Now I am getting new exhaust with mufflers.
5. Loud is fun but does not equal hp/kw.

The more technical among us will likely say that you might lose a few hp from the lack of back pressure. But if that is the case it is not noticeable.

More so you should be thinking about what DB level you are comfortable with. If I had known that having a car that shakes your insides when it starts would ever get old - I could have saved some money. So I think your best bet for the long run is to save up for a quality exhaust - It will still be plenty loud with either test pipes or HFC.

Since you are already looking at exhaust upgrades - focus on maximizing the power benefits first.