Cattman, Mossy or FC Muffler
04-06-2005 | 09:25 PM
#1
Cattman, Mossy or FC Muffler
I've been reading a lot about the Cattman, Mossy and FC mufflers and it seems these are the favorites among all members. Depends on whose posting as to which one is the best, but it seems to me they are equally divided. I think it is safe to assume that each flow the same, but which one is the quietest? I've read Blackbird say Mossy is quieter than his Cattman, but then others say FC is quieter than Mossy due to the resonated tips. Any input would be appreciated. I need to get rid of my stock muffler to complete my exhaust.
04-06-2005 | 10:04 PM
#4
since I'm pretty damn sure nobody here has owned ALL THREE of these, it's more or less impossible for anyone here to compare them honestly. Combine that with the fact that one guy might be comparing his Cattman exhaust with a y-pipe and intake to another guy who has the Frankencar with no other mods to a third guy who has the Mossy with headers and a test pipe.....getting an accurate comparison is pretty much impossible.
04-06-2005 | 10:38 PM
#7
guys...the "restrictive" part is a red herring if you are running a stock cat-forward setup or y-pipe only....you need the "free-flow" primarily if you have headers, test pipes, FI, etc etc etc
Just slapping a catback on a stock exahust setup may make the car "sound" faster and more powerful, but you won't actually be gaining any noticeable power.
Just slapping a catback on a stock exahust setup may make the car "sound" faster and more powerful, but you won't actually be gaining any noticeable power.
04-06-2005 | 10:40 PM
#8
Backpressure idea- wrong. On highly modified NA vehicles- even 4 cylinders 3" exhaust makes the most power. When you get past the intakes and STBs and do some serious mods like cams and tunned engine managment, you will need a large exhaust to flow good at higher RPMs. FYI Mossy is Cattman, identical, made by same company.
04-06-2005 | 10:54 PM
#10
They are MADE by ONE company, Brian doesn't make 90% of his products, but resells other company's products under his own name. Mossy exhaust is made by the same company that makes Cattmans exhausts. My friend has a Cattman on his 02, and I got the Mossy, they are identical. Price is the diff. I been waiting for Greg to get me the price list of his Mossy exhaust for the group deal we are going to have on them. It will cost around the same price as FC exhaust, plus shipping- which is really resonable.
04-07-2005 | 10:07 AM
#11
re: backpressure
backpressure is a necessity for a naturally aspirated engine. that fact aside- a hi compression 5.7L merits dual 3" pipes and collectors. but a built civic? no way jose. just because youve got a camshaft with a larger exhaust lobe doesnt mean you can gain power from a 3" catback. upgrading your pipes is more about velocity of the gases than less restriction. a turbocharged or a hi compression engine can actually gain from larger than 2.5" diameter pipe. the larger an exhaust the less force it takes for the gases to leave the cylinders, but you need to retain a specific amount of velocity or you will lose power and low end torque.
trust me, im a doctor.
backpressure is a necessity for a naturally aspirated engine. that fact aside- a hi compression 5.7L merits dual 3" pipes and collectors. but a built civic? no way jose. just because youve got a camshaft with a larger exhaust lobe doesnt mean you can gain power from a 3" catback. upgrading your pipes is more about velocity of the gases than less restriction. a turbocharged or a hi compression engine can actually gain from larger than 2.5" diameter pipe. the larger an exhaust the less force it takes for the gases to leave the cylinders, but you need to retain a specific amount of velocity or you will lose power and low end torque.
trust me, im a doctor.
04-07-2005 | 10:19 AM
#12
From Mike Kojima's article in the FAQs:
BACKPRESSURE = TORQUE?
An old hot-rodder's tall tale: Engines need some backpressure to work properly and make torque. That is not true. What engines need is low backpressure, but high exhaust stream velocity. A fast-moving but free-flowing gas column in the exhaust helps create a rarefaction or a negative pressure wave behind the exhaust valve as it opens. This vacuum helps scavenge the cylinder of exhaust gas faster and more thoroughly with less pumping losses. An exhaust pipe that is too big in diameter has low backpressure but lower velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque.
Low backpressure and high exhaust stream velocity can be achieved by running straight-through free-flowing mufflers and small pipe diameters. The only two exceptions to this are turbocharged engines and engines optimized for large amounts of nitrous oxide. Both of these devices vastly increase the exhaust gas volume and simply need larger pipes to get rid of it all.
An old hot-rodder's tall tale: Engines need some backpressure to work properly and make torque. That is not true. What engines need is low backpressure, but high exhaust stream velocity. A fast-moving but free-flowing gas column in the exhaust helps create a rarefaction or a negative pressure wave behind the exhaust valve as it opens. This vacuum helps scavenge the cylinder of exhaust gas faster and more thoroughly with less pumping losses. An exhaust pipe that is too big in diameter has low backpressure but lower velocity. The low velocity reduces the effectiveness of this scavenging effect, which has the greatest impact on low-end torque.
Low backpressure and high exhaust stream velocity can be achieved by running straight-through free-flowing mufflers and small pipe diameters. The only two exceptions to this are turbocharged engines and engines optimized for large amounts of nitrous oxide. Both of these devices vastly increase the exhaust gas volume and simply need larger pipes to get rid of it all.
04-07-2005 | 01:29 PM
#13
Originally Posted by luxbond
re: backpressure
backpressure is a necessity for a naturally aspirated engine. that fact aside- a hi compression 5.7L merits dual 3" pipes and collectors. but a built civic? no way jose. just because youve got a camshaft with a larger exhaust lobe doesnt mean you can gain power from a 3" catback. upgrading your pipes is more about velocity of the gases than less restriction. a turbocharged or a hi compression engine can actually gain from larger than 2.5" diameter pipe. the larger an exhaust the less force it takes for the gases to leave the cylinders, but you need to retain a specific amount of velocity or you will lose power and low end torque.
trust me, im a doctor.
backpressure is a necessity for a naturally aspirated engine. that fact aside- a hi compression 5.7L merits dual 3" pipes and collectors. but a built civic? no way jose. just because youve got a camshaft with a larger exhaust lobe doesnt mean you can gain power from a 3" catback. upgrading your pipes is more about velocity of the gases than less restriction. a turbocharged or a hi compression engine can actually gain from larger than 2.5" diameter pipe. the larger an exhaust the less force it takes for the gases to leave the cylinders, but you need to retain a specific amount of velocity or you will lose power and low end torque.
trust me, im a doctor.
04-07-2005 | 03:38 PM
#14
FC may be the heaviest among the bunch if your concerned about weight.
I don't see any differences between cattman and mossy except for price.
Personally I went with the stock muffler but modified everything else.
I don't see any differences between cattman and mossy except for price.
Personally I went with the stock muffler but modified everything else.
04-07-2005 | 03:52 PM
#15
Member
Joined: Apr 2004
Posts: 85
if you have headers and want quiet I hear FC is the way to go. I opted with a free flowing muffler with my headers and let me tell you how much of a mistake that was. I am ditching that pos and getting either a FC or mossey. I just have to make sure the mossey isn't going to drone on a 3.5.
04-07-2005 | 04:40 PM
#16
our muffler was designed to be as quiet as possible WHILE retaining full flow capacity. IF you look at our muffler is it designed similiar to the stock muffler just with much bigger piping and flow. Ours is very heavy due to the robust and well thought out design of the muffler. We promise you will not be disappointed.
thank you,
-steve
thank you,
-steve
04-07-2005 | 05:41 PM
#17
Guest
Posts: n/a
Hey i have intake, y-pipe, race cat, and FC exhaust and its awesome the idel sounds sweet and while cruising at 60 you cant even hear the exhaust but when you floor it sounds sweet i love, i got the FC exhaust after two other homemade type exhaust and i am very happy with it, definetly delivers what it states.
04-07-2005 | 09:21 PM
#18
Originally Posted by luxbond
re: backpressure
backpressure is a necessity for a naturally aspirated engine. that fact aside- a hi compression 5.7L merits dual 3" pipes and collectors. but a built civic? no way jose. just because youve got a camshaft with a larger exhaust lobe doesnt mean you can gain power from a 3" catback. upgrading your pipes is more about velocity of the gases than less restriction. a turbocharged or a hi compression engine can actually gain from larger than 2.5" diameter pipe. the larger an exhaust the less force it takes for the gases to leave the cylinders, but you need to retain a specific amount of velocity or you will lose power and low end torque.
trust me, im a doctor.
backpressure is a necessity for a naturally aspirated engine. that fact aside- a hi compression 5.7L merits dual 3" pipes and collectors. but a built civic? no way jose. just because youve got a camshaft with a larger exhaust lobe doesnt mean you can gain power from a 3" catback. upgrading your pipes is more about velocity of the gases than less restriction. a turbocharged or a hi compression engine can actually gain from larger than 2.5" diameter pipe. the larger an exhaust the less force it takes for the gases to leave the cylinders, but you need to retain a specific amount of velocity or you will lose power and low end torque.
trust me, im a doctor.
04-08-2005 | 06:03 AM
#22
read the mike kojima faq that was referenced.
back pressure and velocity are not the same thing, you are right, that is what i was attempting to illustrate.
importance of velocity > free flow, pipe diameter, muffler design, cats and resonators, b pipes x y z h pipes and a four cylinder's butt dyno
did you want to see my credentials?
back pressure and velocity are not the same thing, you are right, that is what i was attempting to illustrate.
importance of velocity > free flow, pipe diameter, muffler design, cats and resonators, b pipes x y z h pipes and a four cylinder's butt dyno
did you want to see my credentials?
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