Exhaust

Delkevic


Delkevic makes mufflers and complete systems for the GS500.

US site: http://www.delkevic.us/?route=product/category&path=15164&description=Delkevic__Suzuki&category_string=Motorcycles%20%3E%20Suzuki#Products

UK site: http://delkevic.co.uk/index.php?route=product/category&path=1_3964_4016&category_string=Motorcycles%20%26gt%3B%20Suzuki%20%3E%20500%20cc%20Models

They can also be found on eBay and amazon!

Black Widow


Black Widow Exhausts also makes mufflers and complete systems for the GS500.

https://www.blackwidowexhausts.co.uk/gs-500-28-c.asp

Jardine


The Jardine website is a bit difficult to use but they do offer a system for the GS500. It's the RT-1.

http://www.jardineproducts.com/product_sections/cat.asp?CatID=15

Luckily, you can also search for Jardine GS500 on amazon and eBay.

Vance & Hines


Vance & Hines used to make a full system for the GS500. It had black pipes and a silver wrap on the muffler. It is no longer available on the website BUT you might still be able to find it on eBay by searching "Vance and Hines GS500". At the time this was typed, there were active listings on eBay (April 2018).

Slip-On Mufflers


Of course, other mufflers from different bikes could be adapted to fit. The stock pipe diameter has been noted to be 45mm but I personally cannot confirm that. You could find one that slides right on... or use an adapter or mid-pipe for successful installation.

Replace Bolts with Studs and Nuts


It has been suggested several times on the forum to replace rusty OEM exhaust header bolts with studs and nuts. The idea is to wind the stud in and you never have to worry about damaging the threads in the engine ever again, because when you want to remove the exhaust, you remove the nuts on the studs, rather than removing stock bolts.

They are M8-1.25mm but the length needed (for stock exhaust) is unconfirmed.

More information about this can be found here in Showbizwolf's thread:

http://gstwins.com/gsboard/index.php?topic=70880.160