BimmerFest BMW Forum banner
1 - 10 of 10 Posts

·
I'm here all week
Joined
·
190 Posts
Discussion Starter · #1 ·
Hi

I needed a new exhaust as my 10+ year old stock one was a bit old and well, needed replacing. I decided to stick a Scorpion twin 3 inch STW on it.

Looks good (will try and take some pics soon).

Sounds quite nice at first, but I just did a 300 mile round trip and as soon as you go over 60mph the sound is deafening inside the cabin - it just booms with so much bass.

Is there anything I can do about this? It is making my motorway trips a bit tiring. Below 60mph is fine though.

Maybe some cheap and simple thing to plug on the ends of the muffler tips?

:dunno:

Thanks,
Samsonite
 

·
Still here
Joined
·
12,188 Posts
hey buddy

I would check it was fitted properly, as it sounds just like when i had a leak between my pipes after my mongoose was fitted :)
 

·
Registered
Joined
·
31 Posts
I agree with checking the seal where you wrenched it up. The Scorpion is a softer sounding free flow exhaust so it will be louder than your stock but shouldn't be that deafening. I know a few with that exhaust and it is louder than a stock at highway speeds but not to the extent that yours sounds. If your seals are good and you bought it locally or if you didn't bring to a good exhaust house and have them make sure theres no defect. I had a buddy with a Borla that had a muffler defect and it made it louder than hell. Good luck, update us if you find the issue.
 

·
Registered
Joined
·
512 Posts
you could try laying some dynamat down in your trunk and such. kill road noise and keep the sound outside
+1

that was my sugestion... :p

second suggestion:
invest in a better sound system :rofl:
 

·
Registered
Joined
·
174 Posts
I don't know how practical it's going to be for you, but on bikes we often quiet down pipes by stuffing fiberglass and steel wool in the pipe. You can use muffler packing material, if you go to a dirt bike store (real life or online ;P) you can buy 4 STROKE muffler packing (the 4 stroke part is important). Of course, you do this after you make sure you don't have any leaks like everyone else said.

your muffler donuts might be blown out, did you reuse the old ones?
 

·
I'm here all week
Joined
·
190 Posts
Discussion Starter · #8 ·
My local garage happens to be a german car specialist - they think it is fitted properly. They are pretty big pipes sticking out the back so you'd expect a bit of noise.

One point to mention is the car was always a bit noisy at high speeds (under acceleration), and it just seems to resonate more with the extra volume. I wouldn't be surprised if the poblems was already there but now is more pronounced. Maybe I need to look into what else can cause the noise - engine?

I'm not a great mechanic and rely on friends a lot but most of them don't know much about e36s!

Thanks for your suggestions guys - I'll keep on hunting the problem down.
 

·
Monacoblau mit beige
Joined
·
2,203 Posts
Possibly a hole further up in the exhaust system is causing an increase in noise? Just after the catalyst perhaps, but before the new exhaust. We have the same car, I get no exhaust noise whatsoever. There is the engine noise and lifter tick at high RPM or throttle openings, but nothing that is especially loud or booming.

Where did the noise come from before with the stock exhaust on? Was it just from the engine, or did it sound in the middle of the car or further back.
 

·
I'm here all week
Joined
·
190 Posts
Discussion Starter · #10 ·
It does sound like it is coming from the back half of the car - thankfully as we have a 3 day weekend here I will be doing some investigations!
 
1 - 10 of 10 Posts
Top