Post by
WDRacing »
https://forums.nicoclub.com/wdracing-u3125.html
Mon Feb 15, 2010 7:36 am
For me it all comes down to price vs reward. If I was aiming for 500+ whp and had a baller budget then I'd be all about the tubular manifold. But the gains are marginal compared to cost when the power goals are under 500.
Just my .02
The best way to really think about something like this is to compare the NA log style manifold to the tubular header. Which flows more and makes more power, the answer obviously being the tubular header with equal length runners.
Having the exhaust energy exit the head smoothly and merge into the collector while maintaining high velocity is the key. Look at the LS7 manifold...
Not even equal length, but short runners that are so good from the factory that they don't need to be replaced at all. Those are an excellent example of engineering at work. Note the unique oval collector.