Mid Section exhaust reliefs

[VkingMike]

I have some question about the reliefs on different mids. I searched but didn't really find any conclusive information.

Where they different vs years? Example below of my 1993 where it has the rubber boot. I have another one that has the two cast in slots open and being used.

[Aaronhl]

Basically before 91 you have the open slots/no rubber boot
They are more loud and used on the 80s black max split shell cowls
2.0 2.4

And then in the early 90s-2000 when they made the 2.0 and 2.5,
They used a drop on cowl, with the rubber boot integrated into the lower half of the cowl/skirts
It's not as loud as the 80s version

Few of my engines use the older style mid section housing and a drop on cowl, I cut the skirts short so the holes can breathe

[James45157]

my 1989 135 had a drop on cowl

[Aaronhl]

my 1989 135 had a drop on cowl

So i am not sure when exactly the conversion was it could have been in 89/90 around the same time they made the 2.4 200 with the drop on cowl before the 2.5 200...Yours could have been an 89 with drop on cowl from the factory or replacement??

[tlwjkw]

cowl change for all came in '89.. was time for a change plus they had ta make room for tha 40 amp pos water cooled stuff..

[killerpirate]

Is it possible to cut open the blocked slots? Or did they change something also behind the slots?

[KIRCHNER]

If you look in the mid, pwr hd off, there not really blocked, the casting has a anti reversion baffle built in.

[killerpirate]

If you look in the mid, pwr hd off, there not really blocked, the casting has a anti reversion baffle built in.

a WHAT??

[Aaronhl]

OK Took some pics to try to show the details of each of the two style mid section housings

[killerpirate]

OK Took some pics to try to show the details of each of the two style mid section housings


[/FONT][/COLOR]

So you can cut them open and drill a hole in de wall behind it. Right?

[Aaronhl]

I have seen engines on the river runs that have been drilled out, seems like you might need to slot the wall behind the port side too if you want it to be as close to the oem slotted mid section as possible. See how the oem slots are upwards, u might need to measure to see if drilling holes straight in would go through to the cavity

[Glastron1987]

I have a 1988 with the slots and the clam shell cover, and also a 1994 with the rubber boot and the drop on cover. I like the clamshell because it's easier to work on to get at things easily, but I like how quiet the 1994 is.