I notice alot of rattling and whinning when I am in any gear and accelerate past 2000 RPM. The noise comes between 1900-2100 RPM and sounds kinda like a belt wants to squel and loose heat shields. I checked the exhaust thoroughly and cannot find any loose heat shields. I tightened up the belts to the point where if I tighten em any more I'm going to throw out a bearing or something. These noises are driving me frickin NUTs. It's not the VTCS either..I don't have it. It's a 99' ES 5spd. Please help if you can..Thanx

 

geusses are welcome

 

There are 2 TSBs regarding a noise herd during the rpm range you have listed:

Make : MAZDA Model : PROTEGE Year : 1999
Service Bulletin Num : 00600R Date of Bulletin: JUL 28, 2000
Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
Summary:
CONCERNS WITH AN EXHAUST RESONANCE NOISE HEARD FROM THE EXHAUST SYSTEM AT APPROXIMATELY 2200 - 2300 RPM DURING ACCELERATION UNDER MODERATE LOADS. *TT

Make : MAZDA Model : PROTEGE Year : 1999
Service Bulletin Num : 00600 Date of Bulletin: MAR 30, 2000
Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
Summary:
SOME VEHICLES MAY EXPERIENCE AN EXHAUST RESONANCE NOISE AT APPROXIMATELY 2200 - 2300 RPM. *TT

You should take it to the dealership and have them check it out for you.