I have a 1999 Honda Civic EX Sedan, and for awhile its been making a load throttle noise. The noise sounds like if my muffler wasnt installed. I"m not sure if my muffler or the whole exhaust system and even something else. But everything time i accelerate the sound gets louder and decreases when i decel. I dunno, i keep really good care of my civic but this problem came out of no where. If anyone has any idea what the problem is, plz reply asap.

 

Is it like a whinning sound or like a high pitched whistling sound?

 

no, its like a low throttle sound, and this is the stock exhaust. but the sound gets higher when i accel, i'm guessing its the exhaust problem cuz its louder in the back then the front. but i'm not sure if i should change just the muffler or the whole system. cuz i'm afraid that, thats not the problem

 

take it to a muffler shop, they should put it on the lift and look at it free of charge. You may very well have an exhaust leak.