Ok, my del sol has had the basic mods done, IHE. It runs great but sounds exactly how i didnt want it to sound. BUUUUUUUUUUUUUUUUZZZZZZZZZZZZZZ! It has a good melow tone but at normal acceleration I can hear a buz like 2 thin peices of metal vibrating. What causes this? I got the same muffler on my 4dr and it sounds nothing like this. On my del sol i got a highflow cat and 2.5" piping which is not on my 4dr. I am willing to sacrifice power to get rid of the buzzing....So how do i do it?

 

Probably your heat shields under the car. Take a look sometime.

 

that and the fact that when a lot more air is passing through it its going to make a different sound...like when we threw an intake on our car our aftermarket exhaust sound got a lot louder and a lot higher in pitch...if u dont like the sound i recommend a dual tipped exhaust or even flowmaster...both are lower in tone instead of the chainsaw in a tin can sound

 

did you have all new piping put on when they did your muffler? if so then did they put on a resonator? and yea like westcoaststyle said, check the head shield

 

Either a heat shield...or the honey comb looking stuff in the CAT...if you have one..

 

could just be a case of the infamous honda buzz...sorry...its terminal...theres no cure for this god awful problem...lol

 

I believe heat shields too. Check under the car to make sure none of the shields are touching anything.