I have a 2020 FHSTC 114 ci. Added Rinehart mufflers, Feuling 465 cam, V & H Fp3 tuner. Stock pipes. Wanting to get it Dyno Tuned and the local shop is telling me that they cannot. Thoughts?


"The stock headers still being in place will prevent us from being able to perform proper individual cylinder tuning, as we can't get a sniffer up the exhaust and past the catalyst material. The stock headers will also negate almost all of the performance benefit of the cam. We would HIGHLY recommend installing a proper set of headers with a crossover before tuning the bike (or riding it much more, for that matter). "

 

Sounds like they explained it very clearly

 

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Decat the header, or get the matching Rinehart Slimline headers

 

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In simple terms, their equipment cannot get an accurate tailpipe AFR measurement because of the catalytic converter and they are refusing to tune it based on that issue. It's really the only way to get an accurate measurement, but it could be tuned off of O2 sensor readings alone. They do not want to do that, apparently.

 

Why would you do these " performance " upgrades and leave the F'n cat in the first place? They're pretty much right. You're negating much of the performance by not having a much freer flowing exhaust. Cats are restrictive. No good comes from them unless you call heat good.

 

Tell them to buy some Herko Blocks.