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06-25-2017, 04:42 PM #1
20inch Bass Mid section drilling holes?
My question is what is the purpose of drilling 4 holes the two on each side you see on some 20 inch bass mids just below the exhaust tube? Two 1/4 inch holes on each side on those two parts that stick out? Reason im asking is my new mid doesn't have them drilled but my old one was. Should i drill or not, any benefit or Loss? 225 promax.
The holes on my old one are were I have circled in white. What will drilling some holes there do? anything?
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06-25-2017, 05:52 PM #25000 RPM
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if the can is still in the leg it wont do much at all, if its removed you get a little more sound out of them at idle, on the older motors that was the idle exhaust reliefs but on the later style it don't do anything other that what the little hole on the port side with the rubber boot on it does
Allison xb 2003, 280 ROS
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06-25-2017, 07:47 PM #3
Exhaust breathes a little better and dumps water a little faster out of the can on holeshot.
All my 20" are that way
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whipper liked this post
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06-26-2017, 03:47 PM #4
OK thanks my 225pm is a 96. Ive debated taking the can out? How much louder would it be with can out? no performance benefit i would imagine. my power head is off right now changing the adapters so now would be the time to do it. Would it effect cooling at all? Do you simply just remove the can thats it? Gaskets and everything line up wont effect water pump ect...?
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06-26-2017, 06:35 PM #5
Just look at your old can and do the new one the same way ?? It'll be fine .
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whipper liked this post
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06-26-2017, 06:59 PM #6
Ya thanks thats what I was thinking also Paul. dinner time. :] Just thinking i might like the exhaust sound without the tube in there wonder if there are other things other than just taking it out i would have to do?
Last edited by whipper; 06-26-2017 at 07:05 PM.
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06-26-2017, 08:33 PM #7
It just sits in there , pull it out and lighten it up some ! Drill the bottom of the can too if you want . It'll only sound better ! The old mod v p motors came like that !
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whipper liked this post
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06-26-2017, 11:18 PM #85000 RPM
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the can helps keep the heat from the exhaust off the leg, i have seen the paint blister on one, and the paint usually keeps a haze to it, but with the can removed and the bottom drilled it sounds bad azz
Allison xb 2003, 280 ROS
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whipper liked this post
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06-27-2017, 01:49 AM #9
im having trouble finding some pics were to drill the holes at the bottom of the can? Found lots of threads no pics! haha Im working on it now going to remove exhaust tube and drill bottom. lol What the heck. ill try it. Push comes to shove i can always put the tube back.
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06-27-2017, 02:28 AM #10
http://www.screamandfly.com/showthre...haust+drilling
Best thread ever!! Im just doing the 5 hole thing each side can out. i did do the 2 smaller holes in the two spots under the exhaust tube tonight like my other one.
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06-27-2017, 05:14 AM #11
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Slimm liked this post
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06-27-2017, 06:13 AM #12
You're going to love the sound....the neighbors, not so much
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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whipper liked this post
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06-27-2017, 11:20 AM #13
Ya those BB boats open there cut outs all the time. i love that but I love the 2 stroke sound cant wait to hear it maybe today.
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pkstv liked this post
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06-27-2017, 12:31 PM #14
I already have the ten holes at the bottom of my mid. I thought about drilling out the upper ones, but afraid to. I can run my hyd jack down and quiet it down a little if need be. Cant really quiet those upper holes.
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06-27-2017, 12:32 PM #15
Im talking about idle only ofcourse
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