Re: Performance gains from aftermarket exhaust systems
YJ, I took that same approach by adding any incremental mods possible on the performance side. Though in my case, it was on a first available parts basis as I started with an early build WK2.
I may get flamed for this, but IME, the catbacks only add a minor performance boost, and in that regard, much of their benefit is great sound. Guessing here, but you might only see another tenth or two benefit on 0-60 times from the catbacks, where the Hemifever tune will give you greatest incremental gains in both time and price/value. Sorry, no real dynos to back this up, just my own experience on this vehicle.
All that said, love the Borla rumble. So far, I've been able to resist squeezing in a real set of headers.
Borla & Bwoody WOT Audio Video Clips
2011 JGC Oland Hemi / Borla Catback Proto / Hemifever Tune on DS Trinity / Flyin Ryan PTB / Volant CAI / Bwoody Sway Links / BT Catch Can & Underhood Kit / Jon's Tinted Tails / SRT8 Hood, Steering Wheel, Shiftknob, Pedals / Firestone Dest AT's & Winter 18's / Focal 165 Component Fronts, Alpine PDX 5 Amp, Rockford Fosgate P3 10" Sub & Fiberglass Enclosure / PS2 Grill, Mirrors & Liftgate Strip / Tow Hooks & Skids / JW Speaker LED Foglights / Debadged, Tint, Clear Bra / Sharkfin / Vled & Putco LED's / JRoll Uber-Tech Cabin Filter / RA & Yak Roof Rack / Lit Sills, Slush & Cargo Mats