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Old 12-14-2008, 08:47 AM   #52
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FYI...here is a muffler flow/hp test that was done some time ago...it also includes sound level measurements as well.

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).


http://forums.stangnet.com/archive/index.php/t-392314

The Hooker Maxflow made the best power while still being very quiet at idle/2000rpm, but nice and loud at WOT. The Bassani Real Street also made nice power without being too loud.

FYI flowmasts I would agree sound pretty nice, but they don't do much for power, and exhaust systems with a better compromise of the 2 exist.
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Old 12-14-2008, 09:22 AM   #53
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What about GMMG chambered exhaust, I know they will be doing something for the 5th gen Camaro right??
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Old 12-14-2008, 11:00 AM   #54
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Yeah the GMPP is offering actually 3 exhaust. 2 for both the ls3/l99 and one for the ls3 in the v8's.
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Old 12-14-2008, 12:13 PM   #55
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Yeah the GMPP is offering actually 3 exhaust. 2 for both the ls3/l99 and one for the ls3 in the v8's.

Do you mean GMMG, and if so where did you hear about that and where can I find more info? If GMMG comes out with a chambered system I know where I'm going!!
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Old 12-14-2008, 05:30 PM   #56
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Quote:
Originally Posted by pharmd View Post
FYI...here is a muffler flow/hp test that was done some time ago...it also includes sound level measurements as well.

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).


http://forums.stangnet.com/archive/index.php/t-392314

The Hooker Maxflow made the best power while still being very quiet at idle/2000rpm, but nice and loud at WOT. The Bassani Real Street also made nice power without being too loud.

FYI flowmasts I would agree sound pretty nice, but they don't do much for power, and exhaust systems with a better compromise of the 2 exist.

but that list doesnt really do much when those exhausts are tested on a mustang.
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Old 12-15-2008, 02:16 AM   #57
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All of them are listed in the GM performance catalog someone linked in a post in this section. Its on page 324 i think...no prices just the parts and the part numbers.
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Old 12-15-2008, 03:16 AM   #58
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not all exhausts were tested...nothing from SLP.

out of curiosity, who here has heard the SLP loudmouth?
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Old 12-15-2008, 10:56 AM   #59
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Loudmouth (LM) on a Camaro/Firebird? If so, I have and its pretty cool, unless you hate rasp and drone... LOL! With LTs and no cats', you're asking to go deaf. The rasp is really bad. If you get the LM II it's a lot better. I like what they just changed on their F-body design. GMHTP just tested their new LTs for 4th Gens. and the LM and got good numbers, although I don't recall them. I don't think a person would get much more power over your DD as long as that restrictor was cut out of it for max' flow.

I'm sorry if I ranted for nothing if that's not what you meant, LOL!
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Old 12-15-2008, 10:58 AM   #60
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Quote:
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not all exhausts were tested...nothing from SLP.

out of curiosity, who here has heard the SLP loudmouth?
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Old 12-15-2008, 11:17 AM   #61
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Does anyone know who is making the GMPP exhausts? Just asking because the Cobalt cat-backs from GMPP are actually made by Borla. (and sound great)
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Old 12-17-2008, 11:45 PM   #62
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but that list doesnt really do much when those exhausts are tested on a mustang.
flow is flow, more hp would only exacerbate the hp difference with a poor flowing muffler...btw, the new SS will have a true dual set up very similar to the mustang used in this test.
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Old 12-18-2008, 04:26 AM   #63
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Notice a trend?
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Old 12-18-2008, 10:35 AM   #64
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i have a question. i have only had one aftermarket exhaust system and that was flowmaster cat back. im confused after reading on here about the exhaust systems. so if you change your exhaust system does that also change your cats or should you change them as well? sorry if this is a dumb question
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Old 12-18-2008, 12:14 PM   #65
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I will have a chambered exhaust available through Tom Henry Racing.
Who is this "Tom Henry" fella anyways??? (I know I know) I hope you'll be sharing more info when that time comes.

Put a stick under tags gas pedal, see how long it takes for him to find it.
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Old 12-18-2008, 02:46 PM   #66
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i have a question. i have only had one aftermarket exhaust system and that was flowmaster cat back. im confused after reading on here about the exhaust systems. so if you change your exhaust system does that also change your cats or should you change them as well? sorry if this is a dumb question
If you buy a cat-back system it bolts up behind the cats and are a pipe/muffler/tip combo. My previous Camaro/Corvette had an H pipe from the factory between the manifolds and the mufflers. This is the part of the system that has the cats installed into it. If you were going to get a full system it would include equal length headers (to replace the usually crappy flowing cast iron manifolds that come stock) and an X pipe to replace the stock H pipe which will also help for a more direct flow. These can either come as offroad (no cats) or with high flow cats if you have to deal with emissions standards in your state.

There were 2 cats on my camaro and vette. I've heard of older Mustangs having as many as 6 or 7 cats, lol. I got an X pipe with no cats (saved about 400 bucks and there are no emissions laws where I live anyway) on both my cars so I had to get "dummy" O2 sensors installed on my Camaro and the Vette we just reprogrammed the computer to keep it from triggering error codes about the O2 levels.

If you are just wanting a different sound then go with the cat-back/GMPP exhaust upgrade kit since the sounds all about the mufflers. If you are wanting more power then that's where the headers and a full 3" system w/ X pipe would come into play. As stated in other treads you will prob see 20-30 more HP to the wheels with just headers. I saw ~22hp to the wheels after adding headers on my LS1 vette. Trust me if you do a full system you will be able to feel the difference in performance the next time you drive your car. Hope this helps
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Old 12-18-2008, 02:49 PM   #67
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i have a question. i have only had one aftermarket exhaust system and that was flowmaster cat back. im confused after reading on here about the exhaust systems. so if you change your exhaust system does that also change your cats or should you change them as well? sorry if this is a dumb question
Not if you get a cat back system because they only change what comes after the catalytic converter(s), hence the name "cat back" (from the cats...back). But if you really want to get the most out of your (legal) after market exhaust setup you may want to add some high flow cats or get a complete sytem that already has them.
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Old 12-18-2008, 02:59 PM   #68
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Thanks guys. all i have on my stang is aftermarket catback. cant wait till i get rid of this pos for my camaro!
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