I love your forums guys. I'm not much of a poster, just a reader. I noticed this thread and thought I'd add my 2 cents

Dumps have been around for years. The whole point is to get rid of the hot gas before it has a chance to slow down in the exhaust. If you can do this(AND TUNE FOR IT) you will make more power. Best place to put a dump is directly before the cat. Although pretty much anywhere between the collector and the cat will suffice.


As far as back pressure. This is a thing that has circulated through car groups for years and years and years. Back pressure is your enemy. The thing you're looking for here is VELOCITY. The job of the exhaust is to get the gases out as quickly as possible. The faster they're out, the more power potential you have. If you upsize your exhaust then the gases slow down because it's trying to cram the same amount of exhaust through a bigger tube. You'll likely see some sort of gain at the very top of the power band but lose everywhere else. The same goes the other way if you downsize.
Regardless of tubing diameters, and butterflies in the exhaust, and little trolls with brooms the point here is that you want to get it all out the fastest and most effecient way possible.


Occasionally when one removes the exhaust you lose power. Retune the engine to compensate and you will make MORE power then you had when you had the stock exhaust. The difference here being that the engine was tuned from the factory with the stock exhaust installed. It is not used to seeing open header. Compensate with a proper tune and you will gain.


Guys keep these forums great. I love reading all you guys have to say!