hi i was wondering is this a easy swap???

 

i believe it should be relatively easy...but why wouold you put a C-6 on a 351W? It's only a beefed up a C4 and the C4 can still handle a good amount of power. Unless you're building like a super beastly 351W that will put out like 500HP...thats another situation.

 

it depends. what do you have in it right now??