High velocity header collectors, are they worth it?

[gmonde]

Originally Posted by Dave Ribeiro

Has anyone done any testing with extentions on merge collectors, also adding to primary tubes ? thanks, in advance.........

had a set of hookers 1 7/8 primarys with 3 1/2 collectors ,,added extensions and picked up 2-3 hundreths ,,then i built a set of steps with a smaller collector size,merg collector and picked up about 3 hundreths ,,now this is track results and over many runs and conditions this was the average gmonde