Twin turbo SRT4 setup.
10 second SRT4.
Not saying the guy you talked to had anything at all like it, but a dual turbo SRT4 is certainly available(although a single large turbo works much better for them) and a 12 second SRT4 isn't remotely quick for one of them.
Dual exhaust is very popular on those cars too, and of course very stupid(unless you are trying to add weight).
Hitting 40psi is also doable on the SRT4 with the right setup(aftermarket turbo and BOV, HKS, TurboXS) although unless you are running racing fuel you get so much ignition retard it isn't worth it.
The two comments that are way out of line, 10K rpm and 100mph in second gear, not going to happen with a SRT4, not even close. That engine does not like to rev at all, it has a shocking amount of low end and mid range punch for a turbo 4 car, but it doesn't vaguely resemble a revver.
I helped one of my buddies with his 10 second SRT4, was really surprised what you could do with those cars for fairly cheap. Downside, they have nightmare level torque steer and are very hard to launch properly(need to pretty much bog the motor and backpedal through first and second when they have decent power).
My camaro would top out at ~121 in 2nd with the stock 4L60E trans
That's an automatic and it revs quite a bit higher then a SRT4(SRT4 is manual only). 100MPH in third gear may be doable, I honestly don't remember where that topped out at with stock gearing.