Have a cam and bolt-on ls6 6 speed with 3.42's. I'm wanting to add some power to it. 550 at a very minimum. Here's my thoughts..
1. Find a used ls7 and cam it. 550~rwhp
2. Built 408-418 w/ l92 heads. 500-550~rwhp
3. Procharge ls6. 600-700~rwhp
4. Hsc single turbo kit. 650+rwhp(most expensive)
5. Procharge a 4.8, 5.3, or 6.0. 650+rwhp.

I can get a pretty fresh lq4 for $600. I just can't decide which way to try and go. I love n/a but I know it costs alot to get a high power n/a car going. Short block, heads, cam, valvetrain, intake etc. I'm thinking procharge the ls6 or 6.0

 

#3 is your best bet I think. Do centrifugal supercharger and you will easily get there. Some companies are offering the kits at $6000 installed and tuned.

My second choice would be option #1. A H/C/I LS7 would be MEAN in a C5.

 

Easiest way, a bolt on blower kit but, make sure if you buy one, you upgrade to an 8 rib, and buy something with a good belt design. Do your research....

I would suggest a turbo charger or two personally.

 

I went with an LS7 with a cam and full exhuast i got 570rwhp on my C5Z.

 

Meh, I have a 6 rib and have zero belt slip with a ECS 1500. Got the full kit from ECS for under 5500 a few months ago. Stock LS6 and results in sig on 10 lbs.

 

Zero eh?

 

Nitrous isnt a option?

 

Not exactly "cheap" these days, filling bottles. Not to mention, what you gotta do to properly fill one. Dedicate a freezer, the day of or night before, freeze it,...etc...filling completely,..etc... pain in ***.

Don't get me wrong, FIRM believer in it,...it works like a champ....I think I will always have spray on a car,... but I dunno if I would call it cheap.

Sure is addicting

 

Procharger will get you in that range easy. D1SC, FMIC, 8 rib setup, alky control meth kit and let it eat. If you go turbo twins is the only way to do it. Nitrous is fun but not cheap like it used to be plus getting caught without it isn't fun.