GT500 Axleback Users - High pitched rasp when cold?
3/22/13, 02:40 PM
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GT500 Axleback Users - High pitched rasp when cold?
Hey guys,
Like most, I have the GT500 axlebacks on my 2014 6MT GT; I also have the resonators deleted w/welded-in 3" pipe. Everything else is stock.
Seems like before the car is warmed up completely or the first few blasts through the gears, I'll get a higher-pitched "rasp" or "bark" out of them vs. when warm. Anyone else have this issue? Any thoughts on what's causing it (dunno...fibers in the muffler chambers/cats doing something funky)? Just don't like sounding like a civic at any time...
Like most, I have the GT500 axlebacks on my 2014 6MT GT; I also have the resonators deleted w/welded-in 3" pipe. Everything else is stock.
Seems like before the car is warmed up completely or the first few blasts through the gears, I'll get a higher-pitched "rasp" or "bark" out of them vs. when warm. Anyone else have this issue? Any thoughts on what's causing it (dunno...fibers in the muffler chambers/cats doing something funky)? Just don't like sounding like a civic at any time...
3/22/13, 09:01 PM
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well, usually resonators are put in place to tune the sound and eliminate rasp or drone. If you've taken out the resonators, then it's not surprising that you're experiencing rasp.
What was the reason to take out the resonators? the new baffled resonator designs aren't very restrictive, unless the inner diameter is smaller than the rest of the piping.
or could it be what you hear is a rattle?
What was the reason to take out the resonators? the new baffled resonator designs aren't very restrictive, unless the inner diameter is smaller than the rest of the piping.
or could it be what you hear is a rattle?
Last edited by F.D. Sako; 3/22/13 at 09:06 PM.
3/23/13, 07:47 AM
#5
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I'm so glad that when I owned my gt500 aclebacks for a year, I decided against deleting the resonators as most folks here did.
Hindsight, my borla catback setup now has no resonators lol. But then again, it was engineered to be like that and boy, does it sound gooooooooood.
Hindsight, my borla catback setup now has no resonators lol. But then again, it was engineered to be like that and boy, does it sound gooooooooood.
3/23/13, 10:15 AM
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I have the resonators deleted and GT500 axle backs. I've had my resonators deleted for almost two years and have never had the issue the op is describing. Nice deep rumble 100% of the time.
3/24/13, 12:09 PM
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Hey guys,
Like most, I have the GT500 axlebacks on my 2014 6MT GT; I also have the resonators deleted w/welded-in 3" pipe. Everything else is stock.
Seems like before the car is warmed up completely or the first few blasts through the gears, I'll get a higher-pitched "rasp" or "bark" out of them vs. when warm. Anyone else have this issue? Any thoughts on what's causing it (dunno...fibers in the muffler chambers/cats doing something funky)? Just don't like sounding like a civic at any time...
Like most, I have the GT500 axlebacks on my 2014 6MT GT; I also have the resonators deleted w/welded-in 3" pipe. Everything else is stock.
Seems like before the car is warmed up completely or the first few blasts through the gears, I'll get a higher-pitched "rasp" or "bark" out of them vs. when warm. Anyone else have this issue? Any thoughts on what's causing it (dunno...fibers in the muffler chambers/cats doing something funky)? Just don't like sounding like a civic at any time...
3/25/13, 08:21 AM
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well, usually resonators are put in place to tune the sound and eliminate rasp or drone. If you've taken out the resonators, then it's not surprising that you're experiencing rasp.
What was the reason to take out the resonators? the new baffled resonator designs aren't very restrictive, unless the inner diameter is smaller than the rest of the piping.
or could it be what you hear is a rattle?
What was the reason to take out the resonators? the new baffled resonator designs aren't very restrictive, unless the inner diameter is smaller than the rest of the piping.
or could it be what you hear is a rattle?
4/2/13, 05:05 PM
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the rasp is because you removed the resonators.
The reason the Shelby owner didn’t hear the rasp is the 5.4 and 5.0 are completely different. So even though the mufflers are the same: Headers on the 5.0 manifolds on the 5.4, different cats, different exhaust pulses, different firing order etc. They are not comparable in the confines of the OP's question. This is why the GT500 did not require resonators to meet NVH requirements.
The GT resonators do not choke down to 2" they go down to 2.5"
The reason the Shelby owner didn’t hear the rasp is the 5.4 and 5.0 are completely different. So even though the mufflers are the same: Headers on the 5.0 manifolds on the 5.4, different cats, different exhaust pulses, different firing order etc. They are not comparable in the confines of the OP's question. This is why the GT500 did not require resonators to meet NVH requirements.
The GT resonators do not choke down to 2" they go down to 2.5"
Last edited by Stinger1982; 4/5/13 at 01:28 PM.
4/8/13, 07:12 AM
#12
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the rasp is because you removed the resonators.
The reason the Shelby owner didn’t hear the rasp is the 5.4 and 5.0 are completely different. So even though the mufflers are the same: Headers on the 5.0 manifolds on the 5.4, different cats, different exhaust pulses, different firing order etc. They are not comparable in the confines of the OP's question. This is why the GT500 did not require resonators to meet NVH requirements.
The GT resonators do not choke down to 2" they go down to 2.5"
The reason the Shelby owner didn’t hear the rasp is the 5.4 and 5.0 are completely different. So even though the mufflers are the same: Headers on the 5.0 manifolds on the 5.4, different cats, different exhaust pulses, different firing order etc. They are not comparable in the confines of the OP's question. This is why the GT500 did not require resonators to meet NVH requirements.
The GT resonators do not choke down to 2" they go down to 2.5"
4/8/13, 07:14 AM
#13
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Also is the Borla piping 3.0" vs. the stock 2.75 because that changes the tone too
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