HardcoreRM125

Anyone one here with full length headers using the Flowmaster PULSE TECH SCAVENGER COLLECTORS ? ... They seem like a good design, but I donno if they would be worth chopping the ends of a new set of headers off and getting that welded on instead. It says to Expect a 15hp, 25 lbs/ft increase ... So i was jsut wondering, worth the extra 80$-100$ ON TOP of headers that you'd have to have cut and welded then.