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[HILLSIDECYCLE.COM]

We've installed the 66 mm S&S T/H's on modified 120R's.
They seem to work fine.
Scott

[HD Street Performance]

It will take the carb guys another few years to figure out that an EFI motor with high piston flow demand can use larger throttle area and that is the Achilles heal that is taking these motors to new heights by building higher VEs. The plenum acts like a Helmholtz.

[SDCVO]

OK, how about any good (great) tuners in the Orange County area? Not having much luck in San Diego... Even southern Los Angeles would work if needed

[hrdtail78]

FWIW  Have you considered what exhaust you plan on running.  A 66 throttle hog will do great with a Wegner exhaust.  Both are made to make HP.  Put on a better set of pipes for TQ, and the 66 throttle hog won't be a benefit.  As others can explain better.  If the exhaust valve stalls at 130.  No bolt on is going to help.  Throttle blade control helps a bunch in TBW, but remember.  It is a percentage.  7% of 55 and 7% of 66 is different.

Emmet Otter's Jugband is where I want to hear my Helmholtz.

[SDCVO]

Going with a Boarzilla..

[sadunbar]

FWIW  Have you considered what exhaust you plan on running.  A 66 throttle hog will do great with a Wegner exhaust.  Both are made to make HP.  Put on a better set of pipes for TQ, and the 66 throttle hog won't be a benefit.  As others can explain better.  If the exhaust valve stalls at 130.  No bolt on is going to help.  Throttle blade control helps a bunch in TBW, but remember.  It is a percentage.  7% of 55 and 7% of 66 is different.

Emmet Otter's Jugband is where I want to hear my Helmholtz.

Thank you for completing the picture for the OP!     So many get caught up with huge throttle bodies without understanding or explaining the rest of the picture.  Big flowing throttle bodies are only worthwhile if the entire package can handle the same flow rate....throttle body, intake, heads, cams, exhaust...  That's why I recommend either a 55mm HPI or 58mm SE throttle body on an otherwise stock 120r motor...  Good throttle response and good low speed driveability.  If you go larger, then expect to do some headwork and to have some big flowing exhaust in order to reap the benefit...  And find someone able to tune such a package...

[Unbalanced]

Scott,

To that mix I would add the 58 Throttle Hog from S&S, IMO it is the best of the 3 out there atm being SE, HPI and S&S and the cost is right as well.   I would also point out that too many of the people I have seen are mounting a 50mm OD air cleaner opening on a 58 mm throttle body such as the ventilator air cleaner.

In the case of the heavy breather they can open that up and take the downsizing ring out of the center of it which will help the flow.

[mike jesse]

Going with a Boarzilla..

If you like them loud the Borzilla is fine.
I prefer the V/H Power Duals and Crusher Mellows, much quieter and will handle the requirements of the 120R.

[SDCVO]

I really like loud which is one of the biggest reasons Im going with it. I think its the loudest?

[SDCVO]

Ordered everything yesterday, went with the 58mm SE