Before my recent tune I was putting down something north of 450 at the wheels. I have MUCH taller gearing. I could break the tires loose on a hard 1-2 shift. The backend would step out a little bit. I generally don't get on the car hard until 2nd and 3rd is the real money gear.
I have good Mich PSS. So it is very possible there is some issue.
When the ESS kits first came out, many of us had the intake tubes collapsing. Felt like a boost leak and car felt slow. You accelerated great and then about half way through, it just didn't accelerate hard anymore. Once that was discovered and fixed, car felt completely different.
With 3.62 gears, 1st should be close to useless. It should hit redline so fast that you have to be on top of it or you will hit the rev limiter. if not, I suspect there is some issue to be dealt with .
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......