Stock 97 is not tuneable. You need either ecmlink, a 98/99 black box ecu, or some other form of standalone.

Since you just got the car, you’ll have to pull the ecu out to see what’s in there to start with.

Dericsh said:

Since you just got the car, you’ll have to pull the ecu out to see what’s in there to start with.

Click to expand...

Pretty sure it's stock but I'll check it out

If that car put down 320hp it almost certainly has other parts in it. Please expand your profile with whatever you know about the car. It has more than what you list just from the pics. I see a large front mount intercooler for starters.
It will be difficult to help you if we don't have complete information. Thanks.