Over thinking the issue. Look at the Street exhaust. Header-Cat -Exhaust . Even on the M8 Touring bikes it would be easy to remove cat just by pulling exhaust pipes.
Little advice the Bassani pipe for the Street really sucks, loud and just does not sound good. One in the bad idea box down stairs.

 

I am already running the awesome S&S Grand National can. One of the first purchases I made. It was then that I saw the cat material and started the wheels turning. The headpipe assy. is only $154 from Boardtracker. I have the parts catalog.

 

Have you seen the exhaust on a Street Rod? 2-into1 and that it what I prefer. Plus, the cat is in the header just past where they come together and right before the can.

I chatted with V&H's yesterday and it seems there is a full exhaust in the works for the Street Rod. No timeline for release as of yet.

 

The best performance exhaust for the Street/Street Rod is the one V&H makes for the HD flat track bike. However you can't buy it yet. My understanding is one the race teams can get it.

 

I'm hoping for the style that is on the bike. I do not care for high pipes. Once all the hoopla over the M8 being in so many bikes now dies down companies will hopefully start looking at the Street/Street Rod.

 

Without the cat the exhaust will be cooler therefore denser. Being denser it will slow some and have a slightly lower exhaust note.

There will not be any noticeable change in performance. No gain or loss of backpressure.

 

You are now delving into the science of aerodynamics and sound waves/exhaust pulses.

To put it very simply, the performance changes would likely be minimal, unless cams/headwork and induction were optimized.

The catcon does offer some noise reduction. As you know, the chemical reaction does produce heat as a byproduct.

Are you familiar with "stepped tube" headers?
The larger diameter slows the flow of gasses a critical distance from the exhaust valve. This "slowing of gasses" helps scavenge the cylinder of spent gasses on the following exhaust stroke. This allows more fuel to enter the cylinder to be burned on the next "power" stroke because the cylinder is virtually "vacuumed" of spent (now inert) gasses.
This effect can certainly have a positive effect on torque if optimized. Not talking 15%-20% increase here. More like 2% or 3%. But, it IS an increase over "non-stepped tube" headers.

 

A stepped header design would be good for maintaining the torque output of the 750. None of the major players offer up a full exhaust as of yet. The cat chamber is back by where the muffler joins in the party. Maybe I'm making a bigger deal out of this then need be but I don't want to loose power just for lower exhaust heat. The area circled in red in the picture below is the area I am concerned with.

 

Create a bottleneck by removing the bottleneck?
You would be better off spending the thousand if you’re that confused.

 

You are not going to lose any power by gutting the CAT. It never happened on any Bike I have removed the CAT. Never required any re-tuning or anything else. You will notice less heat from the CAT area, you may notice a little deeper one to the exhaust. Other than that you will never notice any difference.
Even on my touring bikes going to a performance header to remove the CAT No noticeable difference. You would have to put it on a DYNO to find any and even then so little it is meaningless. Wanting to believe the money you spent made a major difference just justifies the cost but it your fooling your self. Spent to many hours messing with it, then doing a dyno run to see the difference.