Guys, I love the sound of my car at idle or low revs, but still think it's too loud and raspy when accelerating. I've got ARH 1 3/4 LT's with catted-y, a GMMG catback and a Magnaflow bullet muffler (14419) that I added to try and tame the rasp a little.

Maybe it's just me, so I thought I'd record a couple of video clips to get your opinions.

This is a short take-off video. It starts to get a little loud as I pull away, but I soon had to back off because the bend is pretty narrow...

http://www.youtube.com/watch?v=LopOFou-lgw

This one is in taken inside the car as I drive around the block. Apologies for the length as I don't know how to edit these videos yet! It gets pretty loud at 0:44, but you can hear the raspy sound that I really don't like at 1:26 and 1:59. Sounds a bit like a trumpet to me!

http://www.youtube.com/watch?v=aC1wvZUZAZk

 

Actually, sounds pretty quiet to me.

 

+1^ welcome to the world of performance cars... lol

 

It actually sounds quieter on the recording than it really is, but I guess it still might be fairly quiet compared to other LS1's with long tubes. I just haven't got anything over here to compare it to and that's why it's really good to get some opinions here.

 

its actually not as loud as I thought it would be. IMO it can't be to loud....sounds quiet inside the car

 

Sounds a lot like a car that doesn't have cats which is interesting. Doesn't sound too loud though, just very rasy in the upper RPM range.

 

Sounds good. Don't know how you can manuever on those tiny *** streets though.

With LTs cats, and a cat-back installed, you're not gonna get much quieter than that. I was sick of my exhaust note at 2000-2500 RPM (drive about an hour on the freeway everyday), so I threw down some Dynamat. It helped a little but that drone still kills me.

My advice...buy a louder stereo!

 

It's got whatever cats ARH put in their catted y-pipe - metal spun?

 

Yes, those are typical London residential streets and they can be a real PITA to navigate along - constant breaking.....and then they have the nerve to put speed bumps down most of them too! To be fair, the main roads are better, though sometimes not by much. Actually I used to drive a '72 Charger around, which was even more of a challenge...but lots of fun!

I think I'm coming across as someone who wants a real quiet system, which isn't right. I actually quite like it loud - but deep and rumbly, like it is in the lower rev ranges. I just dislike that piercing trumpet sound it makes at a certain points.

 

Ya i can see how you wouldnt like the rasp. As others have said... it sure sounds like a car without cats.

Have you thought about putting a bullet style muffler in the i-pipe?

 

thats just how these LS1 are when you start modding them, if you want a quite sound un the stock cat back.

 

I've done that, a Magnaflow one. It kinda softened the sound across the whole range and took the edge off the rasp a little, but not by enough.

 

Ah crap ya just reread your post, not sure how i missed that.

Well not sure what to tell ya other then youll have to live with it. Sounds as though the rasp happens pretty bad when the a4 shifts.

 

I think it sounds great! Maybe not loud enough.

If its too loud, you're too old!

 

Sounds quiet to me, but my GMMG doesn't have cats in front of it or a bullet in the I-pipe.

 

That's the only way to go!
Our cars are meant to make statements, ground pounding camshafts, roaring exhausts.. You can't get much more American than that

 

a flowmaster merge should take care of that last little bit of rasp. my friends bolt on LS1 was running a ORY with a dynomouth that sounded horrible. added cats and the merge and no more rasp. The GMMG will always have some rasp, but fixing the merge should almost eliminate it

 

Just wait til you hear it with a cam in it LOL.... Sounds GOOD to me!!

 

Cheers, looks like the Flowmaster merge might be the way to go.....but which one would I need, as there's nine different variations on the Flowmaster site, i.e. what size primary & secondary?

 

It doesn't seem that loud. I think my car with ARH 1-3/4 longtubes with the catted y and the Gibson catback is louder.