my friend just bought there cool head and we instaled it last week...
its nicely made... but i rather a noss head... it only has like 3 o rings... for money i rather a noss head
go with a noss head .. very easy to install and sharp looking..
go to his website(site sponceer ) and it should u what domes to use... u want ur compression at most to be 150-155 area for 91 gas..
you know no one has fucked with it...
how u kow on the older one the guy added the pipes and dident reid it with jetting...
i rather spend the extra to have a the peice of mind... thats y i ought a new biek..