Late to the party. Here's my input on what I've seen for the best chance of getting 300whp with just bolt-ons. Very possible.
All the HR's I've seen put down 290-310whp on dyno jets run:
1. longtube headers 2. dual 2.5 exhaust / single 3" exhaust 3. intakes 4. Osiris tune.
LTH seems to be the biggest gains for bolt-on power.

Video below is running a similar set-up dyno'd 310whp.
Sound is purely opinionated, but IMO it's the sickest Z sound I've heard. Sounds like a circuit car from hell.

 

That's great. So when will you install those bolt ons? In for the result.

 

That's just the average results from the HRs I've seen with those specifics.
I'm going the FI route. Still will include Long tube intakes, downpipes, 3" dual exhaust and the Osiris tune though! lol

 

long tube intakes with turbo? lol

 

Little puzzled as well...

 

Yes. GTM kit includes long tube intakes.

 

But where do they go if the pipes from the throttle bodies go to the intercooler?

* not trying to sound like a d!ck , just asking haha

 

Yeah I guess technically longtube intake is the incorrect terminology.