I got a 97 gt. And i want more power out of it from stock 215 .so I thought about swapping the PI which I've heard was around 260-270 with a SR CAI and a 75mm TB wouldn't that bring it to 300+ right?
with a good tune along with those new parts, yes. youll never reach full potential of new parts in these cars without some sort of tune either a canned bama handheld tuner or taking the car to a professional
8-10 HP increase for K&N Type Filter and Cold Air. 75 MM TB 0-3 HP increase. These engines need more air out(better exhaust) before more air in really helps. A tune can definitely help too.
The 1996-1998 Ford Mustang GT's on average on a Dynojet only make 170-180 rwhp bone stock depending on conditions. Good luck the first place I would start would be with exhaust.
To reach 300 wheel hp you'll need ported heads and non stock cams likely. Any other dyno results are just that. A good PI swapped car (stock heads/cams) will put down 260-270 all day long with long tubes etc.
Gag it with some giggle juice on those stock parts and they'll run 11's all day with traction.