You make about 10WHP gain and FASTER spoolup by replaceing the lower IC pipe with a better solid one. The uppers give you no real power gain BUT don't blow off and aid in the flow of volume if you upgrade in the future

 

If you want the largest pipes....go with the HKS ones. The only draw back is that you will have to either have the small batt kit or remount the battery sideways to fit the pipes. See my pics in the engine pics page. I notices that my spool is a tad faster and the sounds is amazing from both the turbo and my forge recirc valve.

Paul

 

yesevo i know you are man im still waiting on mine 2 i got the top thats good news ...

ill let u know