Firstly, I have no experience with regards to headers or exhausts and I have relied on the opinions/experience of others for my application.
If the article posted by Rebel1 is to be taken as evidence then that article suggests that the whole sytem, not just the primaries, needs to be matched properly.
Perhaps what has happened with this thread is simply a matter of a few "black & white" statements being made instead of qualifying your opinions/experiences. For example, 1 5/8's primaries
may be more appropriate for
most street applications.
While most cobras are modied to some degree, I think based on the entries at the Nationals, most are not heavily modified and consequently not chasing as much HP as they possibly can. If that is considered to be reasonable then 1 5/8 primaries may be all that's needed.
It's all horses for courses. Do you want to chase maximum HP or not?
I think the more support manufacturers give to their clients the better.
Bring on the debate but it would be great if derogatory comments weren't included.
Cheers