Advice please
 

Just brough a V5 type R its running about 320 - 330 bhp but it has an equal lenghth haywood and scott manifold on it. I dont want to loose power and am aiming for eventually 400bhp but want the burble back would putting an unequal length manifold on be a bad move for power and howmuch do you think i would get for the equal length manifold if i was to sell it.

It has probably been mapped for those headers, you "may" have to remap the car if you change them back to unequal length, but note, H&S headers will set you back £400+ and then if you bandage them thats another 70-80 quid.
400bhp wont be achievable on the standard engine though :(

Tony:)