what is this about??
 

http://www.modularmustangracing.com/

is this just as good as a power adder!??

description
MMR Pro-Series Sheetmetal manifold
Supports up to 1800HP, MMR has made over 850+RWHP with this manifold using a 4.6, stock unported heads, stock cams and a MMR tuned FAST system @ 21psi. Available for 4.6 and 5.4, different throttle body locations available

I don't know howmuch HP you would pick up..but no it's not as good as a power adder..probally would pick up like 10-20HP maybe?

o ok cause the whole description threw me off! would it work with a power adder; s/c or turbo and n/a?? ive never seen one of these before!

it's designed exclusively for use with very high revving engines and engines with blower/turbo systems. You would probably be slower with it if you don't have a blower or a 8K rpm bottom end.