hey guys im considering putting a performace chip in my 97 3.8L y87 with a cai and maganaflow exaughst but i have no idea what kind of gains i can expect from the chip which is gonna set me back 450 bucks so id like you opinion

 

I've been told that a mail-in tune is better than the chip. When I was planning on building my car up, I was planning on getting a tune with pcmforless.com or texas-speed.com