Hey guys, new here.

Anyways I haven't been able to access the exhaust page on the wiki (maybe others can't either), and I could only see info if I hit the "history" button.

A few searching back and forth, and here is some basic info for someone wanting to add a slip-on.
It seems that the
2003-2004 ZX6-R 636
1999-2002 Yamaha R6
and 2006-2012 Yamaha R6
all have the same diameter as the GS500 has at the thinnest portion (spot between two welds) which is ~45mm, so that means that slip ons for those bikes will slip onto the GS as well.

However the places where it mounts is going to be different which is why I prefer something that's free-standing like the Jardine GP-1. I also tried to see if i could fit a stock 2000 R6 exhaust but the exhaust itself is too bulky and would require way too much modification, the slip on connection is compatible though.

This is a preliminary analysis from what I've been reading back and forth the past few days. I recommend you double check if you choose to use this as I could be wrong. Thank you and feel free to add!

A stock 2000 R6 muffler has a fixed mount, but an aftermarket muffler for the same year and bike will have a clamp you can position any place along the length of the canister.

The GP-1 slip-on will eliminate any 'muffling' since most of the newer bikes it was designed to fit actually have their muffler under the engine hidden by the bodywork.

Straight pipes on your bike will be extra loud and not necessarily 'nice' extra loud either.

Quote from: SAFE-T on October 13, 2014, 10:00:28 AM
A stock 2000 R6 muffler has a fixed mount, but an aftermarket muffler for the same year and bike will have a clamp you can position any place along the length of the canister.

The GP-1 slip-on will eliminate any 'muffling' since most of the newer bikes it was designed to fit actually have their muffler under the engine hidden by the bodywork.

Straight pipes on your bike will be extra loud and not necessarily 'nice' extra loud either.

Yeah I didn't take that into account at first. Nevertheless I think slip-ons for the models listed should be compatible. I also think there are some GSXR's with 45mm headers as well. Might just be the 1000 with dual-exhaust but I can't confirm for sure.