Silent_Knight30

Hello everyone, I'm a new guy to the site and look forward to fellow ls1 advice! I have an automatic 99 z28 that I believe to be stock besides the flow pro exhaust my father added due to budget issues and K&N air filter that was on the car when bought. Also I've been told by a good friend of mine and others that my car has a tune in it. I honestly don't know, but I do know that other stock z28s I've raced get blown away and I can beat my friends 2015 eco boost mustang which is also stock besides the cold air intake. Anyways I had a question for you guys that I've always wondered. I am only 20 years old and don't have much money yet but my goal is to get my z28 to have 450 rwhp/torque with long tube headers, an SLP air lid, a GMMG true dual exhaust, a turbo, and a tune. I just wanted to know is that possible without replacing the heads and cams which I know is most expensive. Thank you guys!