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muffler - 7/3/2008 10:09:47 AM    kKkInGsRuLeEe   Posts: 6 Joined: 4/13/2008 Status: offline My 305 ''90 RS (common car among these forums) does not have a muffler, the exhaust manifold connects to the pipes running through the underside of the car attaches to the catalytic converter then out and ends near the middle of the car. a mechanic at my work told me that the absense of a muffler will result in a small loss of power, i dunno his reasoning behind it, but is this true? Post #: 1

RE: muffler - 7/3/2008 10:59:02 AM    73camaroSS Posts: 522 Joined: 3/4/2008 Status: offline the lack of back pressure could cause it to lack power on the bottom end but on the top end i could help you, but the lack of back pressure could ruin your vavles ,if you like the sound of straight piped just put on a cherry Bomb muffler it should have enough back pressure for your car. _____________________________ U.S.A. 1, love it or leave it. Muscle4Life! Ford hahahaha. They Circled The Problem http://www.youtube.com/user/73camaroSS (in reply to kKkInGsRuLeEe) Post #: 2

RE: muffler - 7/3/2008 12:25:21 PM    MadMikeZ28 Posts: 3748 Joined: 7/15/2006 Status: offline If you still have a cat on it that will also give you back pressure. _____________________________ Its better to burn out than fade away "Is everyone on DOPE?" Golden teeth and golden tones, welcome to my presence (in reply to 73camaroSS) Post #: 3

RE: muffler - 7/4/2008 6:30:55 AM    kKkInGsRuLeEe   Posts: 6 Joined: 4/13/2008 Status: offline sorry for being a noob, but what''s top end and bottom end? (in reply to MadMikeZ28) Post #: 4

RE: muffler - 7/4/2008 1:22:13 PM    MadMikeZ28 Posts: 3748 Joined: 7/15/2006 Status: offline high and low rpm range _____________________________ Its better to burn out than fade away "Is everyone on DOPE?" Golden teeth and golden tones, welcome to my presence (in reply to kKkInGsRuLeEe) Post #: 5

RE: muffler - 7/4/2008 2:08:50 PM    Jr. Mechanic Posts: 329 Joined: 9/1/2007 Status: offline Back pressue is a myth, give me one reason how it could help you at all... If I were you, I would get rid of the cat and put in a nice muffler. _____________________________ Jr''''s Rides: 1983 Camaro Z28, 1993 Jeep Grand Cherokee, 1997 Plymouth Neon (in reply to MadMikeZ28) Post #: 6

RE: muffler - 7/4/2008 2:28:37 PM    MadMikeZ28 Posts: 3748 Joined: 7/15/2006 Status: offline Back pressure is not a myth. If you have ever changed from stock pipes to aftermarket free flowing pipes on a motorcycle you could easily feel the difference. Thats why manufacturs like Super Trap give you plates so you can tune them. _____________________________ Its better to burn out than fade away "Is everyone on DOPE?" Golden teeth and golden tones, welcome to my presence (in reply to Jr. Mechanic) Post #: 7

RE: muffler - 7/4/2008 4:28:25 PM    Jr. Mechanic Posts: 329 Joined: 9/1/2007 Status: offline Well seriously, explain to me WHY it makes a difference.  I cannot see why.  If you can prove to me within a reasonable doubt, I wont have a problem admitting im wrong. _____________________________ Jr''''s Rides: 1983 Camaro Z28, 1993 Jeep Grand Cherokee, 1997 Plymouth Neon (in reply to MadMikeZ28) Post #: 8

RE: muffler - 7/4/2008 5:34:17 PM    MadMikeZ28 Posts: 3748 Joined: 7/15/2006 Status: offline Don''t get me wrong. I am not saying you need back pressure. In fact when you eliminate it then power is not being wasted. But things were designed with what back pressure that is present in mind. I use a motorcycle as an example because it is the easiest thing and will show a big difference in a simple change of slip ons. Just from changing the slip ons you could notice it feel like a slug in the lower rpm range but feel a boost in the upper. Thats why you would have to do a re-map of the computer or re-jet the carbs. Thats why Super Trap uses baffle plates. So you can tune your exhaust to your engine. Not for sound. I can not explain why backpressure is important because its not really. You just need to tune for the loss of it to gain the performance it gives from freeing it up. _____________________________ Its better to burn out than fade away "Is everyone on DOPE?" Golden teeth and golden tones, welcome to my presence (in reply to Jr. Mechanic) Post #: 9

RE: muffler - 7/4/2008 6:28:56 PM    73camaroSS Posts: 522 Joined: 3/4/2008 Status: offline from what i have heard inless your running a race motor you need back pressure,other wise your vavles will float causeing the vavles wear faster and could cause engine damage in the long run, just put a turbo muffler or a cherry bomb glass on pack on, they will give you a mean sounding car but will also give you the back pressure you need for a stock motor. _____________________________ U.S.A. 1, love it or leave it. Muscle4Life! Ford hahahaha. They Circled The Problem http://www.youtube.com/user/73camaroSS (in reply to MadMikeZ28) Post #: 10

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