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[FAST380]

Is there a huge difference in throttle bodies? There appears to be a huge difference in price. Is the HD 58mm for $350 a decent choice? Should I spend the extra for something else? Collecting parts to do a 113 build. Thanks.

[Scott7d]

I have the HPI 58mm elliptical. I don't know how the different shape is supposed to change anything as far as power, but the bike as a whole runs great with it. I trusted the builder for the most part because he's never steered me wrong. It also went in a 113" build.

I see many builds posted with the SE 58mm that look great. I'd say as long as the rest of the parts/tune are solid, either TB will perform well.

[Rooster]

I went with HPI, a little on the $$ end but there are many just as good options out there now.

[FlaHeatWave]

The SE 58mm w/ 5.3 Injectors works well for me in the 117.

[FAST380]

Thanks!

[FLSTFI Dave]

I'm real happy with the HPI 55mm throttle body with the 58 intake on my 117.  Nice crisp throttle response and nice numbers, 138 HP and 140 torque

[hrdtail78]

I like to suggest the HPI 55/58 TB.  It is a bit more but because it will allow you to use about any aftermarket AC with out modification.  The bottom line price becomes a wash compared to the SE 58 and new AC made for the SE58.

[ds33gt]

Running the 55 HPI on my 124" along with HPI 5.3 injectors and a HD heavy breather setup for a 58mm TB modified to match the 55.    Not sure how much additional I would pick up with a bigger HPI, but doubt you'd ever tell unless you looked at a dyno sheet.

HPI is nice since you send your stocker to them and they swap all the electronics for you onto the new HPI body