I'm going to be coming into some money soon anywhere from $500-1000 what should i buy for my Stock (besides the Flowmaster muffler) 98 Z28 A4 should i buy little things like a whisperlid, catback ... or should i go for one bigger thing like headers or a new cam or would it be smarter to put in new gears and a stall converter if so what gears thanks (just had the car a month)

 

I'd upgrade the gears to 3.42 or 3.73. You don't need a stall convertor yet. They can be a headache. It's not your average installation either.

3.42 or 3.73 gears
Intake Lid
Fernco 3" bellows kit
Flowtech Cutout
K&N air filter
HPP3 or Predator Programer
SLP or Fast Toys Cold Air Kit
ASP underdrive pulley kit

That should cover $1000 with installation.

 

lid cutout converter

 

Subframe connectors.