i expect this has been covered loads before, but im new to this car/site, so appologies if im in the wrong area.

i have a 2004 coupe, and have just put an injun exhaust on (the new 2.5" one,) with kinetic hi-flow cats.
the problem is its now tooo loud.
i love the look and the sound from the rear, but inside it drones and is to loud for my tastes.

can i put back the original cats? will this quiten her down at all, or be a waste of time?
or can i add some sort of baffle, that wont hamper performance?

thanks for your time.
david.

 

stock cats will quiet it down some. you can also add some resonators to the exhaust. might not help the drone, but should tone it down a lil bit.

 

Agreed with Hero..start with the cats and then decide from there if you want to add resonators..Yea the drone gets a little annoying at times especially if its your daily driver. I don't drive my car everyday so it doesn't bother me as much but if there was one thing I could change it would without a doubt be the drone.

-Vin

 

I just added the HKS rear section only. I love the sound inside and out! Much cheaper too.

 

some have installed extra dampening material (under seats) trunk area?

Maybe that would also help?

 

I'll trade you even up for my stock cats and headers. That will quiet it down.

 

leave the cats. get rid of the exhaust. get the hks if you don't want the drone noise in the car.

 

I got the same exhaust. You can loose the drone/vibration by keeping the car at a slightly higher rev as its at its worst in low revs.
Forget wasting money on boot sound insullation etc as they only make a small difference (i did it with Dynamat). The noise/vibration i believe comes from the mufflers being under a part of the floor pan which vibrates like a drum into the rear of the car so i have ordered a wrap to fix around the two mufflers so preventing the vibration waves from bouncing against the underside of the car, its cheap and can easily be removed if it doesn't work. It is also good for high temperatures.
I will post my results.
http://www.saveguard.com/exhausts/thermolastic.htm

 

I'll add this to my list of reasons why I hate all Injen (not injun lol) products. Thanks for the addition!!

 

ffs his like a bad rash that wont go away!!!

However I hope my post was of some HELP to you Dr Dave.

 

Well, from my experience. The drone was pretty bad when I first put exhaust on my G. But, over time I realized the drone seems to be lower. So it does not bother me anymore. I can at least have a conversation in my car now with yelling over the drone.

 

u could alwayws dynomat the floor in the trunk that should help some and if u have the time under the seats too that will help

 

Do not put dynomat down on the floor of the car..its nto going to help that much, its expensive, and its heavy as hell. Dynomat is made to obsorb sound waves its not made to make something sound proof. If you want to do anything to help just put down some insulator underneither the carpet.

If you take out the back seats you will see that there is a foam like material that lays underneith the seats, its the same material that you put underneith carpet in your house. If you go to home depot and buy some of that and then just lay that down on the floor that will help alot.

Thats alot of work though, but yes putting the stock cats back on will help alot.

-sean

 

please don't mistake me for one of your mom's bad STD's.

 

Replace the OEM cats and see how it sounds and go from there..........
you might need to get a better exhaust system in the end!