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Originally Posted by Laika
Tell me more about this. I was contemplating JDL header and stock exhaust but I was told I should look into a resonated exhaust to "free up the flow". I didn't think the stock exhaust was all that restrictive. My end game is to have the most power with the least noise.
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The verdict is out on the stock exhaust.
Having looked at the stock setup, one has to question the balance of velocity vs flow. The stock overpipe looks awful when you first look at it, but the design actually has many benefits for keeping exhaust velocity. Now, what happens when you put a catless header with a 2.5 output on it? That's the big "IF"
The stock front pipe (cat/hemholtz) actually terminates to a 2.5 outlet. The current prototype exhaust (not for mass production) is utilizing that. It will allow us to test both the stock overpipe/front pipe combo with stock or our 2.5" cat back, vs an aftermarket 2.5 overpipe/front pipe with a 2.5 cat back.
This should yield good info as to where exactly the choke point is, and what is most beneficial when it comes to flow vs exhaust velocity. Then we can play with overlap and other tuning aspects to see what creates the "wall" of inefficiency/cylinder filling 3500-4200 RPM...and thus come up with a perfectly sized/mated exhaust for a header.