i have a 95 z28. my only mods are...
Perfomance mods..........
1. K&N cold air intake
2. Trick flow elbow.
3. Magnaflow catback, w/gutted cat...(went bad)
4. slp air foil booster (throttle body mod)
5. RPM Speed Strut Tower Brace (red)

now i want to spend some $$$ and i was thinking of some stuff. but i dont want to **** my money away...

some stuff i was going to buy...
1. march underdrive pullys (crank, alt.)
2. 1le a/c delete pully/braket
3. 52mm throttle body (summit $249)
4. throttle body bypass

so is it worth doing those mods??? also how short of belt do i need for the underdrive kit? is taking off the a/c compressor hard? what special tools are needed for all the pullies and compressor???

 

Nope.Might do some rear end gears.Sticky tires.My02.

 

+1 on the rear end gears.

 

Options 1 and 3 will **** your money away. The A/C delete pulley will not provide any power gains, just some minor weight reduction. The throttle body bypass is pretty much a free mod.

 

I agree on the above. The possible mods you listed won't do much. I would say gears also or maybe some headers.

 

UD pullies are great on cars with belt driven waterpumps, on an LT1 about the only reason to do them is accessory longevity on high rpm motors.

If you want a 52mm TB go with a reworked stocker, if you want to buy an aftermarket get a 58mm, that absolutely requires reprogramming or a shift kit with a A4 car though or you will blowup the tranny. Really not a worthwhile mod at this point though anyway. For the cost of a new TB I would instead look at rockers and springs.

 

You have the intake and exhaust, the only options I would consider right now are:
1 - headers
2 - gears
3 - rockers and springs

 

What I would do....

Get some long tube headers.
Get a nice torque converter.
Get an electric water pump.
Get some nice hooking tires, but them on some 16" salad shooters.
Get a good tune. I can help on that.

Those mods would be night and day on your car.

Also, make sure the car is mechanically fine, good fuel psi, good maf, good opti, etc.

Leave the gears alone.
Leave your A/C in the car.