Ok  I finally have some more spare time (but not to much) so im going to do a quick write up about the scorpion pipe i mounted on the gs.

During my upgrades i was debating on what exhaust to use on the bike.  I didnt feel like paying $200-$300 for a full one but wanted something that would improve performance that i could install myself.  I was able to locate a brand new scorpion exhaust on ebay for $100 including shipping.  The exhaust i ordered was for a gsxr-600 so i figured it would be close enough for the little ole gs.  When it came in the mail i was happy to find out that it came with all the accessories i needed to mount it. 

My first step was to lay out all the pieces next to the bike to roughly get an idea on how i wanted it to be set up.



Once I had a rough idea on how i wanted it to look I pulled out my trusty reciprocating saw and hacked the pipe about 6 inches up from where the two go into one. Once i did that i removed the old can. and place the new one in its spot.



With the new can i place i was able to properly adjust it into the position i liked and at the same time figure out exactly where i needed to make my next cut.  This turned out to be right past where the two pipes come into one.  So once again i cut to the length i needed and filed down any excess burrs that were on the metal.  With the length cut to size i slipped the rest of the mid-pipe on.





I did happen to have some muffler wrap and used that between the old pipe and the mid-pipe.  You cant tell it in the pics.  I did this because i didnt want any exhaust/noise leaks since it is a custom job and these two pipes are not a perfect match size wise.



I did have to make one additional modification.. This was to one of the spacers they sent in the package.  IT turns out that they are just a tad to long and need to be cut down by 1/2 to 3/4 of an inch for you to be able to thread the bolt that secures it just below the foot peg.



After double checking everything and making sure it was all tight i was finally finished.  It only took me about 45 min.  Which i thought was rather quick.  But i was happy with the end product.

wow man, that's really hot! 

What model scorpion exhaust is that so the rest of us can snag one up

Nice! How's it sound on the GS?

 
what model?!

i got this beast on my bike as well. they soung ausome

Would you have to rejet on an F model? I'm not looking forward to doing any rejetting.

i dont believe you have to.   I know if you rejet then you have to change the air filter and the exhaust but i dont think it works the other way.  YOu might have to mess with your idel screw .  But again not sure.

Looks good. I would rotate the clamp so the bolt faces to the left. Not as noticable and gain some frame clearance.

Any time you increase air flow, you will need to re-jet to provide more fuel. The stock exhaust can is very restrictive. Changing jets is not that big of a deal... but knowing which ones to use is a little more involved.

if you only put a slip on like this scorp you dont have to rejet. normally if you put a full system on you might need to rejet. but if you change air filter its a definet rejet.

Quote from: gs500f-gaz on December 30, 2007, 04:03:30 AM
if you only put a slip on like this scorp you dont have to rejet. normally if you put a full system on you might need to rejet. but if you change air filter its a definet rejet.

Dont have to rejet with a slipon???... Might need a rejet with a full system???

The bike is lean from the factory. Any increase in air flow will only lean it out even more. A slipon will increase the air flow. The can is the restrictive part of the exhaust not the headers.

if you put a slip on on the exhaust its doing to be the same diameter as the headers meaning that there is not that much peformance gained. you dont need a re-jet for a full vance and hines system. as its pattern part, dgyver. if you change diameter of pipe then the bike will need rejet. but if you keep same diameter it shouldn need rejet.

Didn't listen to a word he said did ya!   

Quote from: gs500f-gaz on December 30, 2007, 10:06:45 AM
if you put a slip on on the exhaust its doing to be the same diameter as the headers meaning that there is not that much peformance gained. you dont need a re-jet for a full vance and hines system. as its pattern part, dgyver. if you change diameter of pipe then the bike will need rejet. but if you keep same diameter it shouldn need rejet.

With your logic... cut off the muffler and the bike does not need a rejet. 

Whatever. It is not my bike. 

Oh come one Dgyver.  Need is such a relative term.  As long as you don't mind your bike running like shaZam!, getting stupid mileage, and burning the head out if you hold it at high RPM's too long there's absolutely no need.

Very true.

What are your credentials gaz? Is the GS your first bike? I'm no bike expert, but it seems to makes sense that the exhaust "CAN" restricts the air, not the pipes. So it must depend on the type of slip-on whether or not you need a rejet.

GAZ.. I wouldnt argue with Dgyver's knowledge  And like SPCTerry said... You dont "have to rejet" You dont "have" to do anything to your GS but "you should"

Quote from: gs500f-gaz on December 30, 2007, 10:06:45 AM
if you put a slip on on the exhaust its doing to be the same diameter as the headers meaning that there is not that much peformance gained. you dont need a re-jet for a full vance and hines system. as its pattern part, dgyver. if you change diameter of pipe then the bike will need rejet. but if you keep same diameter it shouldn need rejet.

Oh my, what a load of pseudo-scientific bs.  You sound so sure of yourself too, and that's what makes this kind of mis-information so toxic. 

The whole point of replacing the stock exhaust system is to lessen the restriction of airflow through the engine.  Stock mufflers are designed to muffle.  They lower the noise output with baffles, chambers, packing, etc.  Those are all restrictions to airflow.  Removing those restrictinos with an aftermarket can will make a bike run leaner. 
On a factory-lean bike like the GS you really do need to rejet the carbs to compensate or you risk poor performance at best, damage to the engine at worst. 

on all 4 of my bikes i never had to rejet when changing slip on. i only ever had to rejet when i put the full systems on, and normally you put K'n'N air filter when you put full system on.

Well, then, on all 4 of your bikes you most likely were getting shitty gas mileage, lowered performance and running your engine hot.