I have a neighbor with a 2006 GT and his exhaust is hella LOUD...no its LOUD. He told me he had SLP. NOw i have a 2005 v6 but its pretty loud and deep, but no growl. I was thinking about taking out the catalyc converters and adding the SLP resonater I mufflers( I failed spelling class). Later i will be getting headers but let me update u on my setup........Stock headers, cats, H-Pipe and 2 super 40's at the back.
I might go straight pipes from the headers and put the SLP towards the front near the doors and straight pipes after?
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quote:
ORIGINAL: ilmor
Sorry, but if you have a V6, you'll never get the "growl"...at least, I've never heard a V6 growl...
hey, your ride looks pretty baddass and it doesnt have a spoiler!....haha, i prefer NO SPOILER myself and intend on keeping it that way as i continue to mod my body's appearance.......as for the growl, my sixr has it......its just more of an adolecent lion growl instead of the GT's alfa male lion roar....haha .
Posts: 2546
Joined: 10/11/2005 From: Southern California Status: offline
quote:
ORIGINAL: ilmor
Thanks...and I prefer the clean, no rear spoiler look...and at some point I would like to hear the V6 growl. I like all engine sounds!!
aftermarket muffs (or GT take-offs) make the difference. if the GT came with the piece of crap muffs that came stock on the sixr, your GT would sound like an old skinny and sick lion on its last leg....haha. OEM parts, gotta love em .
Yea my friend got pulled over a month back and the cop was a complete jerk.. gave him a speeding ticket... bent over and looked under the car (no cats). wrote him a huge ticket. not worth it IMO.
Look on the drivetrain section on 4.0 for exhaust clips and u should decide for urself which mufflers u like. No cats r illegal in a lot of places so check ur laws. If their not illegal, cut the cats and get some mufflers u like. They will make ur car louder and meaner sounding. I'm not sure about headers and on a catless car b/c u will lose a noticable amount of low end hp, but if u don't care about performance then u can do both. I don't know how this would sound on our cars, but a 99-04 sixer w/mac mufflers, o/r(no cats) H-pipe, and shorty headers sounded very loud and mean from a youtube post. Check that and that's what ur car should sound similar too with that set-up and the right mufflers. Good Luck!
Actually I have a spoiler and a hood scoop to match. My car is pretty damn fast...........i've beaten 02 and 03 GT's so...................all i need is that gurgle. Ive heard plenty of v6 mustangs wit BITE. most 99-04 but this one guy has a black sixxer with high flo cats and straight pipes and it sounds badass! So i think i might just get the high flow cats, the slp resonator 1 and leave the h pipe and 40's. next thing im looking to buy is the sportline springs from EIBACH
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taking the cats off of your v6 will reduce back pressure killing your low end torque and hp
negative....it will free the flow which will slow down velocity of the gases and thats what lowers your torq a tad, not hp. backpressure is bad.
are you sure about that? I mean I know back pressure is something you want to keep to a minimum, but I thought you still wanted some backpressure and that too little backpressure can be a bad thing for your engine. Seems like I just saw somebody post a comment along those lines the other day.
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I currently have MAC Long Tube Headers, MAC Off Road H-Pipe, No CATS and SLP Loudmouths. While it sounds AMAZING at idle, it's too much for me to handle while driving since the whole car shakes. I'm keeping the setup and just putting back on the GT Takeoff mufflers to HOPEFULLY reduce the noise/shaking.
negative....it will free the flow which will slow down velocity of the gases and thats what lowers your torq a tad, not hp. backpressure is bad.
Im sorry but that is incorrect. 1. Increase the flow, increase in velocity, one of newtons laws, but that has nothing to do with why you could lose tq.. 2. You need a certain amount of backpressure to achieve a "vacuum" effect to allow your exhaust gases to effeiently escape combustion chamber. Too much backpressure and it acts like a barrier and all the exhaust wont escape the combustion chamber. The key inst all about the air going in, but also escaping all the used gases as completely and effeciently as possible.
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ummm.....negative wickerbill. backpressure is "BACK" pressure. putting pressure back into your pistons does NOT help your car, makes it work harder which lowers performance. the vacuum you mention brings it back to the engine. how can that be good? zero backpressure is not likely but the least amount possible is the goal and the same time, maintaing high velocity of exiting gases. the faster those gases get out, the faster and easier your engine can work. explain how your vacuum theory pushes out becuase i'm not understanding your definition. the vacuum is actually bringing gases back in which is definately not ideal.
ummm.....negative wickerbill. backpressure is "BACK" pressure. putting pressure back into your pistons does NOT help your car, makes it work harder which lowers performance. the vacuum you mention brings it back to the engine. how can that be good? zero backpressure is not likely but the least amount possible is the goal and the same time, maintaing high velocity of exiting gases. the faster those gases get out, the faster and easier your engine can work. explain how your vacuum theory pushes out becuase i'm not understanding your definition. the vacuum is actually bringing gases back in which is definately not ideal
Its not my theory, its how a engine works. I build these for a living so if I know nothing else I know engines. Im also a pretty good tranny man but thats for another post The vacuum Im talking about is created by the exhaust leaving the head into the header out the exhaust. This creates a vacuum effect at the head ports so that when your piston comes up on the exhaust stroke and the exhaust valves open to let it escape it helps pull the exhaust through the ports out the header, not into the cylinder. There is no such thing as a 100% effecient engine so you will never escape all the exhaust gases out of the cylinder. But with the help of a small amount of backpressure and a good polish port job on heads you can make that engine as effecient as possible escaping the bad unusable exhaust gases out of the cylinder and the good clean burnable air in. Simple mechanics of a engine, you make power by making a more effecient engine.
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Wickerbill,.....OK, thats how i understand the "vacuum" effect happens also but how is that backpressure? that "vacuum" comes from high pressure entering a lower pressure area. if the pressure in the exhaust port is greater than the pressure in the cylinder, the "vacuum" effect would bring exhaust gases back into the cylinder which contaminates the air/fuel mixture, right? the only way i can understand how a minimal amount of backpressure is beneficial would be if the intake/exhaust valve overlap is long and air/fuel has the chance to enter straight into the exhaust port. the backpressure would block that clean mixture and keep it in the cylinder but also "leak" some exhaust back into the cyclinder causing contamination. seems to me that valve timing is critical so that backpressure is not used to keep air/fuel in. I KNOW that an engine isnt perfect but i can't understand how backpressure is a good thing. backpressure "pushes" gases back in, not vacuum out. basic physics can explain that. i'm sure your engine work experience puts you higher than many of us in the auto world but physics is physics and it doesnt take an engine man like yourself to figure it out.
http://www.superchevy.com/technical/engines_drivetrain/exhaust/0505phr_exh/ Scroll down to "Headers -- Primary Pipe Diameters" "Big pipes flow more, so is bigger better? Answer: absolutely not." Same goes for the cats/no cats argument I would think - there is an optimal level of exhaust flow...too much flow = no scavenging, too little = too much back pressure and decreased performance. Taking the cats off would be too much flow for a non - f/i V6, at least that's how I see it.
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Printable Version
CATS or NO CATS? - 
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The vacuum Im talking about is created by the exhaust leaving the head into the header out the exhaust. This creates a vacuum effect at the head ports so that when your piston comes up on the exhaust stroke and the exhaust valves open to let it escape it helps pull the exhaust through the ports out the header, not into the cylinder. There is no such thing as a 100% effecient engine so you will never escape all the exhaust gases out of the cylinder. But with the help of a small amount of backpressure and a good polish port job on heads you can make that engine as effecient as possible escaping the bad unusable exhaust gases out of the cylinder and the good clean burnable air in. Simple mechanics of a engine, you make power by making a more effecient engine.
