I'll start.

Replace the ghastly, stock, bumper car steering wheel with this imitation suede covered one from the CTS-V.

 

Modify the SS's LS3 with a higher-performance camshaft, maybe the "hot cam" in the crate-engine LS376/480. Squeeze a few more ponies out with a better tune, upgraded fuel injectors, etc.

Lighten the car, if possible. Obviously, this can't be expensive, so carbon-fiber body panels are out of the question. Maybe some lightweight wheels and suspension components, as well as a lighter hood and trunk lid. Every little bit helps.

These lightweight suspension components have to improve on the SS's handling. The Z/28 will ride a little harsher, but it will have stellar handling.

 

Use the V6 fascia.
1) I think it looks cleaner.
2) It doesn't have the poser fake air slot.

Replace the grill with a sporty mesh unit.

 

LS3 hot cam, and enough tire and bar to get .95g, and a 70mph slalom. Optional LS7.

 

Bring a "Bumble Bee" option with the dark yellow with black ralley stripes.

 

Lower it.....PLEASE!

 

The SS fascia, minus the "mail slot", would be better. The bottom grille is larger and more aggressive-looking.

Either a larger cowl hood, or a functional hood scoop (similar to the photoshop done by Motor Trend) would work well.

 

Not really Z/28-specific. Something like this could be offered on the whole lineup.

 

Magneto-rheological shocks and associated hardware. Or at the least some Koni adjustables.

Agree with valvetrain changes to LS3.

 

Lighter wheels (LS7 show car design if possible)
275 front tires
Pedders suspension or equivalent
Cold air kit
Mufflers from 436hp Corvette
Hot cam if it'll pass smog
3.73 gears or better
Concept rear valence and exhaust tips
18 Z28 badges and stickers

 

I agree with the 3.73 gears.

I think the accessory ground effects' rear valence should get the nod over the concept's.

 

Along with Dry-sump oiling system, carbon fiber pieces, longtube, and new exhaust system.

 

Enough fender bulge to run 315s front and 335 rears.

Fix the pedals to make it heal/toe friendly.

 

I'd love to see something similar to these looks-wise for the Z/28. I love the chin spoiler - a nod to the one on the '69 Z/28. Paint it flat black just like these. I also love the hood on the two PHR cars. Through in a lighter hood, rear deck and spoiler (and make the gills on the rear quarter functional ). Performance wise - lighter and wider wheels, more aggressive tire, spring and shock package. And of course a massaged LS3 or possibly a "poor-mans" version of an LS7. That's my dream Z/28 anyways.

 

LS7
315's out back
275's up front
Carbon Fiber body pieces where applicable
Very aggressive and very adjustable suspension
Lightweight wheels
Lightweight seats