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Replacing Exhaust on GS450

  • Thread starter Thread starter PhillyCafe
  • Start date Start date
P

PhillyCafe

Guest
Hey guys,

I'm looking to change out the exhaust on my GS450L. It currently has a 2-1 exhaust but I'm kind of partial to the stock look. Any reason to keep the 2-1? Also, what's a good website to pick up some new pipes or place to go in the Philadelphia region to get some bent? I heard MACs sound like crap so if anyone feels different let me know.

Last bit, will I need to rejet after doing this?

Thanks!
 
I think the biggest difference is weight. Stock is heavier.

What 2-1's have you got currently? I might be interested in trading a stock set-up for what's on yours?
 
I'm not sure actually, PO put is set on and they're open pipes. Sound pretty good but truthfully I don't know what the condition is under the tape. When I take them off ill let you know.

I like the look of the stocks but maybe cut a bit shorter.
 
Add a few pictures if you get the chance?

I have been planning on chopping the mufflers off of my stock pipes and replacing them with some shorter reverse cones.
 
jeffasaurus2 said:
Add a few pictures if you get the chance?

I have been planning on chopping the mufflers off of my stock pipes and replacing them with some shorter reverse cones.
Click to expand...

Will do, probably have more pictures up by Friday. Only one I have now is my avatar. Happen to know a good aftermarket set to replace them with?
 
Aftermarket set of cones? Or full exhaust?

I was looking at the cones on Dime City Cycles, right around $50 a piece. If you're looking for the full exhaust I don't know of any (Doesn't mean they don't exist) company that makes new 'stock' exhaust for our bikes. For 2-1 most are the MAC brand ones that are readily available, I've also heard that they sound awfully 'tinny', luckily you can easily remove the muffler and replace or repack.

If you're super lucky you could come across a Kerker 2-1 for our 450's, like https://www.youtube.com/watch?v=f7nEn39MFmU this one. Sounds super good to me. Though I don't think they're made anymore, or easy to come across.
 
jeffasaurus2 said:
Aftermarket set of cones? Or full exhaust?

I was looking at the cones on Dime City Cycles, right around $50 a piece. If you're looking for the full exhaust I don't know of any (Doesn't mean they don't exist) company that makes new 'stock' exhaust for our bikes. For 2-1 most are the MAC brand ones that are readily available, I've also heard that they sound awfully 'tinny', luckily you can easily remove the muffler and replace or repack.

If you're super lucky you could come across a Kerker 2-1 for our 450's, like https://www.youtube.com/watch?v=f7nEn39MFmU this one. Sounds super good to me. Though I don't think they're made anymore, or easy to come across.
Click to expand...

I'm really looking for a full exhaust system to swap out on. I'll take a look around for those Kerker's, sounded awesome, and another look at the MAC's. When I take mine off this Friday I'll post up pictures of it so you can take a look, I would be interested in a trade.
 
Apparently so, from Google it seems that SuperTrapp now owns Kerker.
 
I have a 1985 Kerker on my GPz. When the silencer is packed, it sounds awesome. Throaty, but not too loud. And I am not usually a fan of aftermarket exhausts.
New ones, IDK.
 
Yeah, I dont think you can buy a 'new' Kerker (Supertrapp) brand 2-1 for the 450. From the comments of the video I posted above it seems that his father had that exhaust from when he had raced the bike.
 
According to an earlier post of Dennis' (the PO of PhillyCafe's bike), it's already got a MAC 2 into 1 on it minus baffles...

djg42 said:
Im running it with velocity stacks and 2 into 1 MAC exhaust with no baffles, and its fast as heck!

IMG000182.jpg
Click to expand...
 
pete said:
According to an earlier post of Dennis' (the PO of PhillyCafe's bike), it's already got a MAC 2 into 1 on it minus baffles...
Click to expand...

Pete, thanks for digging that up! I've been rooting through the old posts as I go and this was a post I had not come across. Unfortunately, the bike didn't have the velocity stacks when I bought it but I feel like its something I can do if I feel the urge to.

I didn't seem to think that the bike had MACs only because of its exhaust note, very throaty and nothing "tinny" but that must be from removing the baffles.

I still need to change oil pan gasket so I'll remove the exhaust then and take a look at it's condition under the tape. Once I know that then I'll make up my mind if I want to keep them or go with something else!
 
Pete, btw I noticed the disproportions of the front and back on my bike as well. Happen to have an idea of what that would be other then difference in wheel size between the front and rear wheel?
 
Given yours is an L, you should (if memory serves correct) have a 19" front and 16" rear wheel... what diameter are they? If the front is off a 650, potentially the forks are longer too...
 
Amongst other things I have done this weekend, I took off the exhaust. What I found underneath looks like absolute junk. Take a look...
 
When I took it off, I found out that the exhaust was held on by 3 different sizes of bolts, with one missing. I didnt know why until I found that the hole was bugged.

What do I do with this??
 
That's typical of these old exhaust header bolts.

It looks a bit too far in to do this method, but success has been had welding a bolt or something on to get some purchase and remove it. The heat of the weld can help release it too.

Otherwise, drilling very carefully on the correct angle with a left hand drill bit can get it to budge.

Whatever you do don't use and Easy Out on that... guaranteed it'll be stuck fast and the Easy Out will break off and then you'll have even more pain to deal with.

Worst case take it to a machine shop to get it out.

Once it's clear, use a tap to clear up the threads or if they're completely buggered, you can use a helicoil insert to repair it and get it back to the right size.

Also, a lot of guys have had good success installing studs in place of the bolts so you can tighten the exhaust down using nuts rather than bolts.
 
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