[x808drifter]

Originally Posted by churchx

I wouldn't consider similarity to stock as any kind of pro, rather opposite, as stock header for several prioritized reasons, like emissions, mass production cost, clearance, might be more compromised then aftermarket parts with performance as main goal.
Characteristic subaru-ish UEL was not put there on many subbies for specific sound. Design was chosen such to reduce material used and cut costs, with worse performance compensated with more boost. I'm sure, that there are many compromises with stock twins header aswell, such as below optimal runner lengths, too wide merge angles and such. Different priorities.

I love all the hate I get when I tell people this.
If UEL was/is so good then why don't any pro race teams use it.