If you have a second car or do not mind the 2 week downtime(from when i receive your manifolds) they will be your originals modded. Otherwise you can pay a core charge and ill send you an already completed set and upon receiving your stock manifolds in good condition you are refunded that amount.

I may even go ahead and try to have a modified set on hand in the future, that way delivery is immediate. But the MB guys are gonna want theirs to say "AMG" not "SRT6" so id really have to have 2 completed sets on hand which is more costly to myself. I suppose it depends on how many commited purchases i get.