For me Nitrous is out... it reeks of fast and furious cheese and only has a place in drag racing where it is necessary. Its frequently added to low hp motors and abuse and poor installation leads to blown motors. Not worth the hassle or the ricer image imo.

Blowers - I can see the appeal, its less stress on the engine than turbos/nitrous and delivers good gains. However its costly and usually needs a good tuner to set up and map despite mailorder DIY applications being available. Can encourage a lot of young kids to ruin their motors by promising easy DIY horsepower.

Turbos - definatly more hassle than a supercharger and costs way more due to a lot of parts needing custom fabrication. Needs more mapping than a blower upgrade and theres likely to be fewer people who would offer this package. Definately will require a strip down to add forged internals etc.

I personally believe theres no replacement for displacement. The big 6.1 has a nice stock output identical to the old hemi. If i was going to keep the stock motor id probably go for big ported heads, headers, cat delete, side pipes and upgraded cam. This with a reflashed ecu would be an old skool way of going but should see me past 500hp and thats plenty to use on the street without uprating the chassis and brakes too much.

I have had a bit of a brainfart though and thought hmmmm you see all these restomod musclecar shops that take a 70's body from a cuda or camaro etc and then drop in the modern day fuel injected compact V8. Id like to see someone taking a new retro style challenger and dropping in a brand new big block carburettor fed crate hemi! 5-600hp from the engine alone and a real elephant motor under the hood! [8D]