I run the JP4 with the RB long header , this does give you a nice power curve and good fuel economy . It produces a higher power curve to the 2045 but that combination gives good power without being to aggresive
If you want good bottom end power run a turbo plug button head and up the nitro and if that doesn't work than go the BB C6 , that motor is really aggresive compared to the S7 and WS7 , you'll have more than enough bottom end then no matter what exhaust or header you run
