Dyno tested Long tubes ,are they really worth it ?

[Jim_rockford_007]

 

[GTP091]

Interesting video.   Makes me think The benefit of long tube headers is only going to be worth it on normally aspirated engines where scavenging is important.

[Jim_rockford_007]

Im figuring the headers outflow the heads and the stock manifolds are plenty enough for the exhaust port flow capabilities, even ported to heads can only flow so much air. therefor the restriction in the exhaust isn't the manifold but the heads themselves. 

[mfewtrail]

It would be interesting to see what, if any, differences there would be when using an actual full length exhaust with both the stock manifolds and the long tubes.

[Jim_rockford_007]

would be just the same if not a tad lower but adding the rest of the system  would not gain anything on either setup.  I do wish he would have done the headers on reguler fuel though and not E85