Exhaust Recommendation Wanted

[libila]

As the titles states, I'm looking for a recommendation on a full exhaust system for my auto-x/road racing Super. This will be a dedicated racing car so I don't need to keep the heater boxes and it can be louder

My motor is going to be stock (besides the air filter, exhaust, and some jetting). I want something that is going to make a significant power increase while still maintaining some back pressure. I would like it to exit out of the stock exhaust cutouts in the rear apron, but it's not a must.

I'm open to ideas so please speak your mind. Person experience, hear-say, or just ideas are welcome. Thanks in advance!