This wouldn't be a "cheap" bolt on part...nor quick...that's time consuming and would require at the MINIMUM a grand the way L32 pricing is going for a full setup. You could top swap for half the price...but then a custom tune would be needed, along with supporting mods...so it would close in on a grand as well.
I want to know what top end you're talking about? My N/A car was modded, and top end didn't exist...hell, even I didn't have much "top end" on my XP'd/3.25"/Headers blower car. 3800 =/= top end unless you go the snail route.
Not really anything you have to worry about "banks" wise without boost...you could knock the pee out of an N/A motor on crappy gas and a clogged cat and it probably wouldn't chip or pop a piston like a boosted car would.
If I had an N/A car, like I said...I'd do it this way...
Intake of whatever kind, doesn't matter...probably whatever is the cheapest they all do the same thing...
L26 UIM + HV3
Catless Headers/Stock Catback + Whatever mufflers/tips you want...they don't matter...just make noise...no gains.
ER Higher Ratio Rockers or GT2 Cam with L76 or Crow 105 Springs
Ported Lower Intake
Ported/Polished Heads
Then, enjoy beating stock or small bolt on GTP's...because that's about all it'll net you until you boost it. Expect in the range of 210-230 FWHP.