So i've been doing quite a bit of research on upgrades for my 18 Road glide special. I have Bassani True Dual head pipes and V&H 450 Destroyer 4.5" slip on's with stage one SE air cleaner. I have the dyno sheet for this set up highlighted in red.
After talking to Fuelmoto, they insured me that my exhaust set up is one of the worst possible for performance on the M8, even though it looks and sounds good, lol.
Looking at what i want to do, (Woods 22x cams (i like low rpm tq and hp), and new exhaust, which would be the Jackpot 2/1/2 head pipe into the Jackpot Outlaw slip on's) i found a dyno sheet from Fuelmoto that compares my current set up to the new one.
My question is.... is this for real??? Wow... my set up currently is terrible. Look at the huge gap in TQ alone at 2500 rpm of 18!!!
Would this be a reasonable expectation using the Fuelmoto premapped Power Vision tuner or would i need to get it dynoed...
Looks like about $1650 shipped for everything...If these could be my results than it would be a no brainer???
true dual exhaust is an extension of the old idea of drag pipes.
for years people equated flow (no back pressure) with more power.
problem is, unless you're planning to spend a lot of time in the higher revs (like in a drag race), they just plain don't work well as street pipes.
the best pull i ever got on my 80" Evo was with the old kerker y-pipe that split the rear cylinder exhaust into two pipes.
not only did it provide flow on the top end, it helped scavenge exhaust gases out of the front pipe, and vice versa.
a good exhaust will be tuned to pull those gases out – so they aren't sucked back into the cylinder – and fill it with a diluted mixture. (reversion)
i would follow the advice of FuelMoto if for no other reason than they can be held somewhat responsible if it doesn't work out lol
their dyno sheets indicate which combinations work well together and seem to be a pretty good picture of what to expect.
i have their outlaw pipes on my bike and they work well. they are thick steel and are made well.
after a few miles the packing burns out and they sound good, too, for an M8.
my buddy says they sound like an old rat rod.