BIGGEST POSSIBLE HEADERS ON ROCKET 2500CC

Just pinged him so I will let everyone know when I hear back. That way he doesn't have to reply to 20 emails.
 
Here is what I got in my mailbox today:


No photos yet but when I get them I will post them here.
(above is a direct quote and all grammar and spelling belongs to Paul)
 
yes, I can fiddle around a lot more now, I can make 2.5inch straight pipe but I dont know long it should be,

Can anyone provide inputs from their experience, if I were to put at 2.5inch straight pipe how long it should be?
Exhaust formulas are your friend.
 
Could use the old drag racing trick of running a long pipe and then cutting it off 6 inches past where it turns color/burns the paint off.
Yea it's works mostly on 2 stroke. Done that a few times. You end up chasing your tail a bit because it's a constant retune on most cuts on non 2 stroke engines.
That is to say it's easier to build a high end exhaust and then tune the fuel map for it.