If you "do away with the discs all together" and left the end cap on... the exhaust would only have one slot to come out of instead of the 9 slots you have now.

What year do you have?  A friends 86 had a spacer (ugly gray) behind a chrome ring on the header.  And just barely makes the front hole.  A little too tight in my opinion as it tore up the rubber bushing.  Remove the ugly spacer and push the super up the the chrome ring.

One more thing, we both are having blueing at the front of the super.  Someone suggested that it maybe from an exhaust leak.  I looked at his and each of the slots were building up carbon from the exhaust leaks.  Those slots are going to have to be filled.  

I have had that suggested to me & got close to going for it, but, just seems too close to unrestricted. If I was gonna do that, I would have bought a Jardine or something with very little restriction. The Trapp is tuneable. More so than any other exhaust. If you open it up, you may like it, I dunno, I think it will be to loud for on old fuddy duddy like me.But, I would sure be poking a fat main in it if I did that. I have a bit of an odd runnin S40, I have restored the white spacer within 1/100th of stock, have a 150 main, supertrapp with 14 disks, K&N drop in, Iridium plug, stock pilot & it doesnt growl & snarl on decelat all, maybe a slight poof once in a while. Still need to go study it, like a high speed throttle chop & stuff like that.

The situation with getting the TRapp up the header far enough to get both T-Bolts in is not uncommon.Mine wouldnt go, so I used an angle grinder to shorten the header. Shot sparks down under the bike, right past the battery vent tube. Exploded the battery,Bad news all around. But, now my battery has no vent tube! Its a Big Crank gel type. So, you can run it with the one bolt or shorten the headr, OR maybe you can force it on further, some here have managed,My header had a bend in it that just wouldnt allow the TRapp to go on any further, good luck