how is that possible when I made 387rwhp stock and now I'm at 420rwhp+ tuned on 93 octane? Mine was done at 5th gear with 3:31s manual
What kind of dyno did you use? If it was a DynoJet, that immediately explains higher numbers with very mild mods, along with it being a manual. With those mods, I highly doubt you were on a Mustang Dyno.
My baseline of 321 rwhp was a mixture of the dyno type, the car being an automatic, the tech not taking traction control off, and him leaving it in drive versus using select shift. If I'm not mistaken, most baselines for manuals on a Mustang Dyno are closer to 340 rwhp.
With the latest run on a Mustang Dyno, the car was in 3rd gear using select shift (4th topped out at about 120 mph; AM is sending me a dyno tune), and traction control was turned off. I was using the 91 race tune, which combined with the headers, got me an additional 40 rwhp in 3rd gear at 106 mph. According to the tech, I would have gained an additional 5-7 rwhp if we could have run it in 4th. That puts my realistic gain at 45-47 rwhp (366-368 rwhp total), which I think is pretty damn good for just adding headers and a tune.
I could go out on a DynoJet right now and probably make at least 420 rwhp, but to me, it's just inflating my numbers to make it look better. As mentioned before though, the primary goal is to use the same dyno to get a baseline and then accurate gains for mods.
Have you run yours at the track? We only have an 1/8 mile track here and I'm really looking forward to getting back out there. I did one run with just exhaust and a tune; I ran an 8.53 with a crappy reaction time (probably would have been closer to 8.3 with a little work). I'm anxious to see what I run with the headers installed.
2013 GHIG Mustang GT Premium (Delivered 10/9/12)
Airaid Race CAI, Boss IM, Kooks 1 7/8" LTs, Kooks catted Boss H-pipe, Boss QTP exhaust cutouts, Borla S-type axle back, AED E85 tune, Steeda upper/lower control arms, Steeda bumpsteer kit, Ford Racing sway bars, Eibach lowering springs, Ford Racing adjustable shocks & struts, DSS one-piece aluminum driveshaft, FR 4.10 gears, 18"x9"/10" AMR wheels, Nitto NT05R 305 drag radials, Cervini's hood, Roush grilles, California Special fog lights