The Catback thread
The Catback thread Is there a thread with all the catbacks for these 4th gen fbodys where they’re tested maybe when it comes to noise dB or performance?
i tried to search but I’m not getting what I’m looking for.
my old car had full exhaust ory pipe, magnaflow exhaust and it seemed perfect as far as not too loud but not too quiet. I’m curious if all the catbacks were tested by someone at one point and compared.
thx
i tried to search but I’m not getting what I’m looking for.
my old car had full exhaust ory pipe, magnaflow exhaust and it seemed perfect as far as not too loud but not too quiet. I’m curious if all the catbacks were tested by someone at one point and compared.
thx
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From: Michigan
There isn't one that I know of. The Magnaflow is probably the quietest aftermarket cat back. I switched from GMMG to Magnaflow because I was about to put a cam in my car, for the short time I drove around with the stock cam, long tubes and no cats, it was way too quiet IMO. But since I added a cam, I think it's just about perfect for day to day driving, I have a cutout too though.
The old ls1sounds webpage used to have tons of uploaded exhaust clips and IIRC they did have some DB info but that webpage looks to be no more. Maybe some of the older members or mods know if the website was moved.
I ran the magnaflow also and I like it but personally my fav is the borla non adjustable.
The consensus around here for a long time was the slp loudmouth was brutally loud.
I ran the magnaflow also and I like it but personally my fav is the borla non adjustable.
The consensus around here for a long time was the slp loudmouth was brutally loud.
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so if you want to kill rasp, look not at your catback but at your Y pipe. But you can most certainly play with the sound the car makes by adding resonator, cats or glasspacks into the system to help eliminate unwanted frequencies.
The tsp catback is a lot like a magnaflow so it should be pretty tame at idle, very loud at wot and have a deep boomy sound. So long as it has enough packing material it should inhibit drone like the magnaflow catback does.
On The Tree
Joined: Feb 2013
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I've had a SLP Loudmouth 1 on my 95 Z28, a Magnaflow catback on my 95 Z28, and a SLP LMII on my current 99 LS1.
At one point during the end of the 90's boom, the choices for Fbody catbacks was endless!
Rasp happens when your not getting enough backpressure, the LM1 was really bad with LT's and no cats.
At one point during the end of the 90's boom, the choices for Fbody catbacks was endless!
Rasp happens when your not getting enough backpressure, the LM1 was really bad with LT's and no cats.
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the rasp it a function of poor Y pipe design. Tsp sells a y pipenthat is shaped like a Y that promotes good scavenging. Many other cheaper or older Y pipes run the merge more perpendicular and in some cases, the merge point for the passenger side exhaust is actually much smaller in diameter. This causes horrible resonance we hear as rasp.
so if you want to kill rasp, look not at your catback but at your Y pipe. But you can most certainly play with the sound the car makes by adding resonator, cats or glasspacks into the system to help eliminate unwanted frequencies.
The tsp catback is a lot like a magnaflow so it should be pretty tame at idle, very loud at wot and have a deep boomy sound. So long as it has enough packing material it should inhibit drone like the magnaflow catback does.
so if you want to kill rasp, look not at your catback but at your Y pipe. But you can most certainly play with the sound the car makes by adding resonator, cats or glasspacks into the system to help eliminate unwanted frequencies.
The tsp catback is a lot like a magnaflow so it should be pretty tame at idle, very loud at wot and have a deep boomy sound. So long as it has enough packing material it should inhibit drone like the magnaflow catback does.
Last edited by 99Silver6.0; Mar 3, 2020 at 09:25 AM.
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From: Woodstock, GA
I have the TSP catback and on the highway at 2k, there's a drone. I have a good loud sound system so it doesn't bother me. I will say that I warned my Mother a few years ago that it's going to be loud. When I could hardly hear you speak once on the highway, I apologized to her. She said, "oh I love it." Classic from an 85 year old woman. 
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I have the TSP catback and on the highway at 2k, there's a drone. I have a good loud sound system so it doesn't bother me. I will say that I warned my Mother a few years ago that it's going to be loud. When I could hardly hear you speak once on the highway, I apologized to her. She said, "oh I love it." Classic from an 85 year old woman.
I’m curious if the y pipe merge really does cause the rasp.
overall obviously the catless y pipes are raspier than the catted. Yet the merge is probably the same?
i bought a used magnaflow exhaust that I plan to install rather than the gmmg, I’m also debating adding a resonator to the i-pipe of the magnaflow just to see if it would quiet it down a little since I’ll probably install a cam at one point.
overall obviously the catless y pipes are raspier than the catted. Yet the merge is probably the same?
i bought a used magnaflow exhaust that I plan to install rather than the gmmg, I’m also debating adding a resonator to the i-pipe of the magnaflow just to see if it would quiet it down a little since I’ll probably install a cam at one point.
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I’m curious if the y pipe merge really does cause the rasp.
overall obviously the catless y pipes are raspier than the catted. Yet the merge is probably the same?
i bought a used magnaflow exhaust that I plan to install rather than the gmmg, I’m also debating adding a resonator to the i-pipe of the magnaflow just to see if it would quiet it down a little since I’ll probably install a cam at one point.
overall obviously the catless y pipes are raspier than the catted. Yet the merge is probably the same?
i bought a used magnaflow exhaust that I plan to install rather than the gmmg, I’m also debating adding a resonator to the i-pipe of the magnaflow just to see if it would quiet it down a little since I’ll probably install a cam at one point.
Here is when I had the mag catback and a crappy Y merge.
In person, sounded deeper. Like a big block.
I have the AR 1 7/8 that I am about to install.. I have ran the Borla on most of if not all of my 4th gen fbods and really liked it. With heads,cam ( which I plan on doing down the road) I know the Borla will drone and be crazy loud as is the Corsa, GMMG (Madhammer), LM... The Magnaflow seems like a no brainer. I have listened to numerous clips on YT...
Deep tone at idle, nice 3.5 in tips, SS, Sounds great at WOT.... and < $700....
Deep tone at idle, nice 3.5 in tips, SS, Sounds great at WOT.... and < $700....
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I have the AR 1 7/8 that I am about to install.. I have ran the Borla on most of if not all of my 4th gen fbods and really liked it. With heads,cam ( which I plan on doing down the road) I know the Borla will drone and be crazy loud as is the Corsa, GMMG (Madhammer), LM... The Magnaflow seems like a no brainer. I have listened to numerous clips on YT...
Deep tone at idle, nice 3.5 in tips, SS, Sounds great at WOT.... and < $700....
Deep tone at idle, nice 3.5 in tips, SS, Sounds great at WOT.... and < $700....
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just put a qtp electric cutout in place of the plates and its a great setup. mine doesnt really drone, its just alot louder with the cutout open, with it closed its quiet relatively speaking. this is with 1 7/8 headers, tsp offroad y and the borla. the magnaflow is nice but its also a lot more restrictive then the borla. at the track there is no performance difference with the cutout open or shut with the borla since the muffler is a straight through design and its all 3"
