I hadn't thought about the length of the vacuum lines affecting the map signal, but i'm not too worried about it. I'm getting a good responsive signal with this setup.
One issue I did experience was during WOT tuning. Several of the screens on top of the velocity stacks got sucked into the stacks. Luckily they were all stopped by the ITB butterfly.
I ran them for awhile without any filters, but I wasn't too comfortable with that setup for obvious reasons. I looked into filter socks, but read reports of issues of limited airflow with them.
I settled on adapting a PMO Weber K&N filter and rain hat setup that I ordered from Pelican.
The adapters started with more Triumph parts. These are intake boots that come on several Triumph motorcycles and a set of 3 can be had for about $15. These come with a round rubber coupler and clamp on one side, a bolted flange with o-ring on the other side.
The coupler and clamp side fit on top of the ITBs, and I designed an adapter plate that was waterjet cut that the bolt flange side attaches to.
The plate is 3/8" thick to allow for clearance above the fuel rail
I previously had the FPR mounted directly to the fuel rail, but the new filter setup interfered, so I added a straight union to space it out. This is a better connection anyway.
