In a straight line the SRA will outperform the IRS, although a well built IRS can do quite well.
If its anything like the terminator IRS I wouldnt get my hopes up.
From what I understand the pistons are aluminum. Not 100% on their durability but the boss rotating assembly(which the coyote now has) seems to be quite stout.
On 93 I would say that 8#'s is right about where you'll want to be in terms of max safe boost. But that all depends on quality of gas...
I would say look at a current boss with a procharger and see what it makes, you should also specify the amount of boost you will be running. At around 8# I dont see 600rwhp on a safe tune to be out of reach.
Forged internals? Forged crank and rods, yes. Pistons? I believe those may be the weak...
Aside from a slick, the amount of sidewall you can run really doesn't affect your traction.
My buddy owns a 2010 camaro with 20's and 315 NT05's and dead hooks. He makes 420+ wheel.
Several turbo mustangs on 19's that run low 9's with decent 60"s as well.
Then again this is from a drag...
Twin scroll is simply the design of the manifold. It doesnt not mean how many turbos there are.
A single scroll turbo uses a manifold that has X amount of primaries(in our case 4) that merge into a collector and then mate to the turbo flange.
A twin scroll turbo uses a manifold that separates...
I personally think this model may look better without a spoiler. The rear seems to have a duckbill esk lip integrated into the trunk, which is nice and subtle. On the flat trunks like the 05'-10's the factory spoiler looked pretty nice. I'm biased to no spoiler on any car, however.