2009-2013 Cadillac CTS-V Performance Mods Discussion, my dyno comparison: 9.55 lower v. 9.1 + 2.55 in Cadillac CTS-V Series Forum - 2009-2013; 2011 A6. Mods in both pulls (same dyno), spaced a few months apart, are stainless works headers and exhaust, new ...
2011 A6. Mods in both pulls (same dyno), spaced a few months apart, are stainless works headers and exhaust, new era intake, hennessey heat exchanger, TR6IX plugs, and a mildly ported snout. The lower numbers are with just a 9.55 lower, seeing about 12.5psi on the dyno. The higher numbers are with a 9.1 lower with a 2.5 upper, and reflowed injectors to 72lb. Everything else remained the same. The 9.1 + 2.55 setup pegs the boost gauge at 15psi, but the actual reading on the dyno was just over 17psi. IATs were in the 140s on the new setup, so next up I'll be addressing heat with an additional reservoir, heat exchanger pump, and coating the headers and intake. Nothing to worry too much about now headed into winter but definitely going to be pulling timing on warmer days.
Basically the car picked up roughly 55whp and 60wtq from 3000rpm through redline, with a peak increase of 62whp and 74wtq.
Here's another 2012 A6 Coupe DynoJet pull, a few less mods. 9.55 lower pulley only, ported snout and ported 87mm throttle body, W4M heat exchanger, D3 radiator, 160 stat, 1.85 rockers, BB sport cat back, Airaid CAI, and a Jesse Bubb SCT tune. Runs 125 MPH @ 11.07 on drag radials. This pull was on a MAX105 octane tune with ~98 octane fuel, 603 hp and 587 torque, on 91 it made about 15 less HP and 10ft/lb less torque. I see 14 pounds boost all the time [no headers]. Oh! stock injectors, 11.3 to 1 air fuel ratio on every pull, no boost a pump either. I think with a touch more traction it's a 10 second car.