Just food for thought here on some of the most talked about topics on this forum...exhaust slip-ons, baffle modifications and IED's. First, my bike a 08 FLHTCU has a V&H Fuel Pak and SE A/C, V&H basic slip ons - no other mods at all.
I studdied the stock LEFT muffler baffle and found it to be more of a reversion baffle ( if you have looked into the muffler with a flashlight you will know what I mean). I think it is nothing more than a restrictor to control gasses exiting or entering that muffler at a calibrated rate. I"m sure this plays a big part in cylinder scavaging as well. The stock RH muff as we know looks like a standard EPA pile o crap inside.
Last year I ran with the V&H Fuel pak calibrated for the SE A/C and the V&H Basic slip on muffs. Bike ran fine but got hot and I wondered if I may have lost a little low end torque as well. Hang with me on all this 'cuz it's important! I thought if maybe I built a replica of the stock LH "baffle" to fit inside the V&H muff it might help with torque/scavaging..so I did. I also have a set of the IED enrichment devices to try out...so I did. Unfortunatly, I can't ride a bike in the snow so all my "data" is steady state no load in the garage. My A/F sensor was placed deep inside the RH muffler forward of the baffle for accurate measurements. This is a very very accurate meter I am using BTW. Keep in mind all these resuslts are what they are and I don't claim to be a expert, just curious. The fuel pak settings did not chage throughout this process. One thing it prooves is that the fuel pak don't modify the closed loop operation at all (idle heat or MPG). Although reversion from the LH muffler my play a big part in the "perceived" AF ratio, nothing other than the IED and baffle were changed.

WITH MODIFIED LH BAFFLE AND NO IED
IDLE CLOSED LOOP 14.8:1 = "parade duty" after 5min
2000 rpm closed loop 15:1 = MPG ok air to cool eng (going down road)

WITH MODIFIED LH BAFFLE AND IEDs
IDLE CLOSED LOOP 13.8:1 = no more "parade duty mode"
2000 rpm closed loop 13:1 = gas milage sucky!

STOCK AS IS V&H BASIC LH MUFFLER NO IED's
IDLE CLOSED LOOP 15.2:1 = damn near instant "parade duty mode"
2000 rpm closed loop 16:1 = ouch!

STOCK AS IS V&H BASIC LH MUFFLER AND IED's
IDLE CLOSED LOOP 14.1:1 = no more "parade duty mode"
2000 rpm closed loop 16:1 = ouch!

The question is however, with the modified LH baffle will the bike make more low end torque and still outflow the stockers???? I have to ride to find that out! I still don't like how any of the A/F numbers look though. It seems if I run cool at idle, I will have a huge gas bill once I hit the freeway!! Well, I think I need to call Jamie at Fuel Moto and order his entire set up! OK, thats what I did tonight, so lets hear the comments! LOL

 

I would like to see the results of an exhaust system from Jamie thrown into the mix. I would gather that the scavenging would be better but you have to remember that the left exhaust is different from the right in his setup.

 

I agree. That is one of the reasons that I decided to try it myself and see. Assuming that Fuel Moto's LH baffle emulates the stock one as does mine. It's a shame I don't have a dyno in my garage to check the torque! The way I see it, if Fuel Moto do it, HD do it, than it may be the best thing to do from a low to mid RPM performance stand point. The aftermarket exhaust industry is full of cool looking and sounding exhaust systems for FLH but at a big sacrafice in low end grunt where these big bikes need it most. The best thing to do is run a true 2-1 system but I can't bring myself to do it on a dresser! I'm going to buy the PC5 that just came out so I'll be giving Fuel Moto a call soon. The reason I want the PC5 over the PC111 is so I can have speed dependant fueling. In other words 13.8 A/F closed loop @ idle sitting in traffic, but 14.4 during steady state closed loop condition on the freeway.

A correction to this data entry!!!

STOCK AS IS V&H BASIC LH MUFFLER AND IED's
IDLE CLOSED LOOP 14.1:1 = no more "parade duty mode"
2000 rpm closed loop 16:1 = ouch! ------ SHOULD HAVE BEEN WRITTEN AS 13.3:1 a/f NOT 16:1 SORRY!