Custom Dyno tune

[12:1]

Originally Posted by Andreasy

I have this slip on which is large enough. Sound without the slip on was acceptable when installing it so it's not that db killer that concerns me. My concern is the result of I removed that, the bread box and the cat. Yes the bigger slip on will help but i don't know how much

I was in the same boat with my RS. Akrapovic header (weight saving alone is worth the admission price, not to mention build quality and aesthetics)
Neighbours said they could hear me from over a kilometer away with the free flowing stock can. I bought a used akra slip on and even that was too loud (made a $100 on the resell)  I ended up with a full size yoshi R77s. Matches the 40mm akro at the beginning but 75% in it ramps down to 35mm. I can now cruise away from home without any negative feedback and it seems perfect at high revs. Take your SC DB killer down to an exhaust shop and get them to modify it to a 35mm outlet. No point though if you don't go full headers. You gain 10bhp with free flowing exhaust and a dyno tune. Don't skimp on exhaust gaskets either, they are a one time use crush gasket. Buy 2 sets.

[notsoaverageguy]

On the exhaust gaskets, you can reuse them ,(I have several times) just take a flame (propane butane ext..) get them glowing red and immediately throw them in cold water. It Re aneals  ( expands them) ready for Reuse.

[12:1]

Originally Posted by notsoaverageguy

On the exhaust gaskets, you can reuse them ,(I have several times) just take a flame (propane butane ext..) get them glowing red and immediately throw them in cold water. It Re aneals  ( expands them) ready for Reuse.

Just gave it a go on oem gaskets. Gave one 90 sec with map/pro benrzomatic torch hanging from a coat-hanger wire, it was hard to get a uniform red, then straight into cold water. Thickeness measured 2.10 mm before and 2.10mm after, none of the header pipe high/low indentations changed on the gasket.
I just buy 3 sets of K factory gaskets from webike any time I put an order in if needed. I did try to reuse the OEM once (without the above) and had to chase down a ticking noise that ended up being the flange gasket. Each one to there own. Maybe might work with an oxy but not for me.
Z900 not listed but just used a set on the z900 motor, same/same.
https://japan.webike.net/products/24983285.html