exhaust question??
07-08-2005, 06:26 AM
#1
Platinum Member
Platinum MemberThread Starter
Join Date: Apr 2001
Location: Saratoga Springs, N.Y.
Posts: 2,910
Likes: 0
Received 0 Likes
on
0 Posts
exhaust question??
On my 36 cat what would be the the best way to meet the current 90db. stationary test? 525 Mercs with the standard Nor-Tech exhaust. Thanks P.S. On my previous boat with a similar style of exhaust ( just smaller diameter), the CMI clamp ons got my 496's to 88db. at idle.
07-08-2005, 07:47 PM
#2
Registered
Re: exhaust question??
May want to read through this thread Chuck. Also, Wiggler is doing a lot of testing of Nortechs with different muffler combinations, so it might be worth giving him a call.
http://www.offshoreonly.com/forums/s...d.php?t=106039
http://www.offshoreonly.com/forums/s...d.php?t=106039
07-09-2005, 04:49 AM
#4
Banned
Join Date: Dec 2003
Location: st. louis,mo.
Posts: 1,647
Likes: 0
Received 0 Likes
on
0 Posts
Re: exhaust question??
GGB makes the only 6" clamp on extreme right now. will probably bring you close to 90, they also have a new 6" insert that I think works and looks alot better, that is 19" long. I'm assuming you have the wet cmi exhaust . no angled water dumps at top corners. CMI has a new sound elimination system but requires all new tailpipes and they have to install it and is very expensive. I would try the 6" inserts first. Nortech is working on a retrofit turndown for higher hp applications, but a 525efi should be around 100db;s open ggb's will drop 10-12 db's.
07-09-2005, 09:02 AM
#5
Platinum Member
Platinum MemberThread Starter
Join Date: Apr 2001
Location: Saratoga Springs, N.Y.
Posts: 2,910
Likes: 0
Received 0 Likes
on
0 Posts
Re: exhaust question??
Originally Posted by wiggler4490
GGB makes the only 6" clamp on extreme right now. will probably bring you close to 90, they also have a new 6" insert that I think works and looks alot better, that is 19" long. I'm assuming you have the wet cmi exhaust . no angled water dumps at top corners. CMI has a new sound elimination system but requires all new tailpipes and they have to install it and is very expensive. I would try the 6" inserts first. Nortech is working on a retrofit turndown for higher hp applications, but a 525efi should be around 100db;s open ggb's will drop 10-12 db's.
