Is this sound normal from LT's and a Borla catback?
03-31-2009, 03:46 PM
#1
Is this sound normal from LT's and a Borla catback? I currently have LPP long tube headers and a Borla adjustable catback. I just recently removed my two mini-cats from my Y-pipe and am noticing a strange sound coming from under the car in the 2500 - 4000 RPM range when under load. Again what I am hearing is coming from under the car.
Its a light rattling almost raspy sound and it must be exhaust pipe related I never heard this sound when the cats were on and nothing else has been changed. I have been under the car and everything is tightened up and the pipes are not hitting anything. The sound is very annoying.
Is this a normal sound to expect from running long tubes, without cats and a Borla exhaust?
Its a light rattling almost raspy sound and it must be exhaust pipe related I never heard this sound when the cats were on and nothing else has been changed. I have been under the car and everything is tightened up and the pipes are not hitting anything. The sound is very annoying.
Is this a normal sound to expect from running long tubes, without cats and a Borla exhaust?
03-31-2009, 05:05 PM
#2
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I currently have LPP long tube headers and a Borla adjustable catback. I just recently removed my two mini-cats from my Y-pipe and am noticing a strange sound coming from under the car in the 2500 - 4000 RPM range when under load. Again what I am hearing is coming from under the car.
Its a light rattling almost raspy sound and it must be exhaust pipe related I never heard this sound when the cats were on and nothing else has been changed. I have been under the car and everything is tightened up and the pipes are not hitting anything. The sound is very annoying.
Is this a normal sound to expect from running long tubes, without cats and a Borla exhaust?
Its a light rattling almost raspy sound and it must be exhaust pipe related I never heard this sound when the cats were on and nothing else has been changed. I have been under the car and everything is tightened up and the pipes are not hitting anything. The sound is very annoying.
Is this a normal sound to expect from running long tubes, without cats and a Borla exhaust?
03-31-2009, 05:18 PM
#3
When I used to run a Borla and off road y pipe with my LTs, it had a raspy area from 22-2800 or somewhere in that rpm range. This was when my car just had bolt ons.
When I got my first heads and cam setup, that raspyness got really bad and it sounded like ****. I ditched the Borla for a Magnaflow and it sounded good.
When I got my first heads and cam setup, that raspyness got really bad and it sounded like ****. I ditched the Borla for a Magnaflow and it sounded good.
03-31-2009, 07:18 PM
#4
When I used to run a Borla and off road y pipe with my LTs, it had a raspy area from 22-2800 or somewhere in that rpm range. This was when my car just had bolt ons.
When I got my first heads and cam setup, that raspyness got really bad and it sounded like ****. I ditched the Borla for a Magnaflow and it sounded good.
When I got my first heads and cam setup, that raspyness got really bad and it sounded like ****. I ditched the Borla for a Magnaflow and it sounded good.
Fergy,
My noise is in that range too and usually when under light to moderate load.
When you heard the noise, did it sound like it was coming out the bottom of the car?
Did it have a rhythmic sound that had a distinct pattern?
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03-31-2009, 08:40 PM
#9
My noise was just exhaust noise. It wasn't anything making contact or vibrating off something else. It just got a really crappy tone to it after the heads/cam setup. It sounded great with just bolt ons for the most part, other than the small raspy area.
04-01-2009, 08:25 AM
#10
I am now convinced that it is simply exhaust noise. When the cutout is closed it has the muffles machine gun sound and if you open the cutout it is the loud machine gun sound. Both sounds have the same pattern.
I am waiting for a local exhaust shop to get me a quote on doing mandral bent trual duals with a full size single dynomax x flow muffler out to the tips. If it ends up being an arm and a leg, I might get the Magnaflow catback since most claim it has no rasp.
I am waiting for a local exhaust shop to get me a quote on doing mandral bent trual duals with a full size single dynomax x flow muffler out to the tips. If it ends up being an arm and a leg, I might get the Magnaflow catback since most claim it has no rasp.
04-01-2009, 08:50 AM
#11
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