Dissapointing performance

IQ52 said

Though the shorty isn't as good as a long tube header, they are a major step up from the cast iron manifold. If no one has already posted this, here it is, a dyno test with stock cast iron, shorties and full length.

Manifolds Vs. Headers - Mopar Muscle Magazine

Click to expand...

Except when they look like this:


That's his "headers". 1-5/8 tubes into 2 inch collector. Tubes are different lengths, eliminating any scavenging effect. Hi Pro 340 manifolds have a bigger collector. So yes. They are worse than headers or manifolds. In my opinion.