Mufflers
#12
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On CP perfpramance's website under the muffler section the have a test on a 25' Daytona with a 502 mag. The boat did drop 12 db, but it also dropped 200 rpm.
#13
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The Hardin Marine one at the top looks the same as the double X.
http://cpperformance.com/products/Exhaust/024.htm
http://cpperformance.com/products/Exhaust/024.htm
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Originally posted by Pantera572
Tried a set on a 305 chevy in a small Donzi. Worked well. Took off some of the harsh sound.
Don't think I would try them on much higher HP applications.
Just bought a set of GGB muffler tips for a
Merc 525. Designed for high HP motors.
Will be posting photos and results in about a month.
Greg
Tried a set on a 305 chevy in a small Donzi. Worked well. Took off some of the harsh sound.
Don't think I would try them on much higher HP applications.
Just bought a set of GGB muffler tips for a
Merc 525. Designed for high HP motors.
Will be posting photos and results in about a month.
Greg
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I installed a pair that look the same as in the pic, If I remember right I got them from Rex Marine. They seem to work well for me. I had to do something,I think it sounds good. I'm still not sure how it would do on a db meter and I don't think it would get the approval of most tree hugger types. I will say,I do boat where there a little sensitive and nobody's bothered me so far. As for performance loss I only ran it on the trailer without them. But I feel the boat performs as it should with a stock 7.4.
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I tried them on my 502 mag. and lost 200 rpm, and also the tailpipes got so hot you could even touch them normaly they are only warm to the touch. I drilled a bunch of holes in the center plate and that helped a bit, but i only use them when there is a chance of a problem.
They do cut the noise down quite a bit.
They do cut the noise down quite a bit.
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![Default](/forums/images/icons/icon1.gif)
Originally posted by Pantera572
Just bought a set of GGB muffler tips for a
Merc 525. Designed for high HP motors.
Will be posting photos and results in about a month.
Greg
Just bought a set of GGB muffler tips for a
Merc 525. Designed for high HP motors.
Will be posting photos and results in about a month.
Greg