2017 F450 STX SoundOff HLF


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I'm doing an install on a 2017 F450 STX within the next few weeks and I'm having trouble locating the correct HLF. From my understanding, I only have one option for the TLF which is the ETFBSSN-P.

The SoundOff Website Flasher Lookup shows: ETHFSS-SP

Other professionals in the industry say to use: ETHFSS-FV

Then leads the question as to whether or not I require an Isolation flasher...

Any guidance/direction would be much appreciated! Thank you!

They are the same thing. The FV just has the pass side wires extended and a bracket so lots of people use them cuz eaiser to.install. It's made for the Ford Interceptor Utility. Both both are simply an ISO (4 wire) HLF.
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