Supra makes wierd rattling noise after 3000 rpm on every gear HELP!

[89MkiiiSupra]

Hey guys, so check this out, i got a great deal on this supra for 4500. basically this guy rebuilt the motor and it has under 10,000 miles on it. he did alot of mods including

New Air Compressor Jun 08 $ 225.00 New A/C Drier Jun 08 $ 45.00
New Radiator Apr 08 $ 211.00

New Alternator Feb 08 $ 93.00

New Wheels Feb 08 $ 751.04

New Tires Feb 08 $ 725.00

Air Cleaner Hose Feb 08 $ 55.22

Lower Radiator Hose Feb 08 $ 31.00

HKS Metal Head Gasket Feb 08 $ 105.00

ARP Head Bolts Feb 08 $ 115.00

Head Gasket Set Feb 08 $ 223.05

Power steering Hoses Feb 08 $ 25.00

Thermostat Feb 08 $ 7.00

Rebuilt Cylinder Head Jan 07 $ 525.00

Fuel Injector Seals Jan 07 $ 35.04

Timing Belt Jan 07 $ 50.48

Timing Cover Seal Set Jan 07 $ 26.60

Valve Cover Gasket set Jan 07 $ 24.00

Heater Hoses Jan 07 $ 134.67

Spark Plugs Jan 07 $ 18.60

Total Wheel Alignment Jan 07 $ 60.00

Front Sway Bar Jan 07 $ 165.69

Front Sway Bar Link Jan 07 $ 60.78

Front Struts Jan 07 $ 78.27

Rear Struts Jan 07 $ 78.27

Front Brake Rotors Jan 07 $ 156.74

Brake Pads Jan 07 $ 20.18

Rear Brake Rotors and Brakes Jan 07 $ 151.88

Rear Brake Pads Jan 07 $ 17.97

Lower Ball Joints Jan 07 $ 118.56

Parts Total $4334.04

• Engine Rebuild @ Approx 167k $ 2000
  

Total After Engine Build ( minus Labor ) $ 6334.04

Approx 10K since motor rebuild and 1000 Miles on recent Head Work.


So i got this for a pretty good deal, there were reciepts and everything. When i got the car everything was fine, but than i let one of my friends test drive it, he made sharp ass u turn and my wheels spun out and we basically drifted sideways left to right and he was about to crash my fcking brand amazing ass supra into the pole but he got control again. than after maybe about 10 mins i started hearing a rattling noise everytime you past about 3000 rpm. So i brought the car back to my house and reved the engine and it sounds horrible, before 3000 its fine but after than its just a bunch of rattling. CAN anybody tell me what this is? Possible when he spun out my wheels he couldve snaped something or possible made something loose? I was going to take it to the shop but i dont want them telling me a bunch of bullshit so i wanted to see if anyone on here had the same problem as i. thanks