Hello,
Now that its time to dump the rusty OEM exhausts on my 300 Tempest I am looking for a little more performance on a very reasonable price. My aim is on the GLM 58234 complete set, and I found the manifolds shaped very clever. However, I dont want to compare them with Eddie Marine or Performance Marine exhausts, which are more than twice expensive.
My question is quiet simle:
Has anyone of you got experiences with the GLM exhausts ?
How is the quality, material and the craftsmanship?

Thanks for reading and
Thanks for your answers in advance .
Greetings from the North of Germany
Andreas ( Luko)

It is very good stock replacment system and will actually perform close to the other brands listed as all of these just use simple seperated exhaust port design. I checked your part number with GLM to confirm what it was and they didn't know the part # ???

Hello Kepp,

I found the N° for a complete set (both sides) of manifolds, 4'risers, spacers and bolts + gaskets at GLM homepage and at several other places like this one here : http://www.boatequipmentsuperstore.c...manifold-kits/
Dennis Moore did give me this number and I ordered the set with him today.

In about two month I can tell a little more about the tuth, facing my hopes and fears about budget tuning.

Thanks a lot for your posting
nice rgds and happy skating in 2009

Andreas (Luko)

cheaper alternative to other manifolds. decent quality. MUCH louder than OEM.

I run them on my 385ci SBC. No problems. I did have a problem with water leaking at the riser/manifold mounting flange. Turned out it was due to the powdercoating on the sealing surface. I sanded all the PC off to bare metal and it's sealed up fine ever since.

My risers are FastGlass 3" ID 4" OD stainless risers. I welded on 22" long extensions and the water and exhaust does not mix until inside the tips.

A few vids....

http://www.youtube.com/watch?v=ORkMT3JMWu8
http://www.youtube.com/watch?v=fyKTqEhzfCc

http://usera.ImageCave.com/ryanootj/DSC00366.JPG

http://usera.ImageCave.com/ryanootj/DSC00368.JPG

I used them on my 415hp 502's. Quality seems fine. The paint wasn' real pretty, so I repainted them with nice epoxy paint. I didn't notice any real performance gain.

Hello again

the GLM ehaust came in some weeks ago, and I am
N O T S A T I S F I E D with it.
Why?

The finish is poor, very poor, indeed!

-Paint was peeling off the gasket areas,
-on the collector (lower exh) the "2 halves" of the casting molds did not match, steps of <=4mm are visible, if you are looking into the gasports.
-the gas and waterports were still clogged with sand-casting-residue.

But I did not return them( too expensive) , nor dump them (to my regrett I am not rich enought to do this). but startet working on them :

STEP 1
cleaning all the gasports with ab pneumatic grinder and gave them a better shape ( some would say porting job)
STEP 2 glaspearl blasting, esp. of the waterports
STEP 3 blowing all clean and
STEP 4 flooding the waterports with antirust and paint again
STEP 5 painting the rest of it

I will tell you about the effects of the GLMkit + work on the Tempest 300 SBC , when I have tested it .
This will take another few weeks, for sure

Thanks
for your interest

nice rgds from the North of Germany
Andreas (Luko)

That's unfortunate, I hope you're able to make them work.