So I am looking at a 2015 mustang gt premium. Roush stage two package. The owner says it has about 450 hp. Is this correct. What would it take to get it to the 700? Just when I look up roush stage two there's a lot that says roush stage two has 700. I would just have to go from stage 2 to stage 3 or what. Is it possible to do that what is needed. Is it the $8,000 kit. If so then maybe one day haha.

 

Hello,

Welcome to TMS!

You Were in The 2010-2014 Gt 5.0 Specific Section So I Moved You To 2015 Roush Section. I Would Cut to the Chase and Get a Vin From the Vehicle and Contact ROUSH Direct to See What Your Options are and if They are Legal as Far as Emissions in your State. If It Has Roush Parts The Vehicle Should be in Their Database!

https://www.roushperformance.com/

800-597-6874

Mgb,

KC

 

The big difference between the stages and the power level, is the superchargers. I thought Stage 1 was appearance only, Stage 2 was appearance plus handling, Stage 3 was supercharger and big HP bump. Roush should be able to tell you for sure, like KC suggested.

Assuming it is not supercharged, 450 is pretty close for a 2015 5.0, maybe a little on the "optimistic" side.

 

With Bert on the Roush Stages... The Stage 2 will have whatever the stock horse power ratings are unless it has a tune and/or engine modification by the previous owner (after Roush). The Stock GT was delivered with 435hp.