and yes that Gp is for DD

i agree that if he only wants mid 13s, a used s/c is cheaper.

one reason to go turbo is that at the same psi, the turbo will make 30-40 hp more than the s/c. injectors won't have to be as big to reach the same hp. the s/c will run out of breath when the turbo is still going strong.

personally i don't like the sound of modded s/c w bodies. turbos have a quiet, low rumble. you also get better fuel economy with a turbo.

a t3/60 turbo ($615), zzp crossover ($450) and down pipe ($400) - integral wastegate, no blow off, no intercooler - will give him easy high 13, and more potential than the m90 s/c.

the s/c ($600 gev5 m90), headers (minimum $360), pulley ($45 + install tool), 1.9 rocker arms ($300).

i'm comparing new parts...sure you could find a s/c for $300 or less...and have custom exhaust cheaper than zzp. my point is that a turbo isn't much more expensive than s/c at this level.

if you think you might ever want 400+ whp, turbo is the only way to go. ride in a fast car and see what you like, and can handle.