Drilling the T pipe how much does it help?

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Active Member
Apr 12, 2012
Ok, so I know with the HRC kits a replacement T vent comes with it, but i was wondering what size drill bit you guys are using on these, and if there is a noticeable increase in power from such a simple mod.



mmhmm bacon!
Apr 10, 2012
I can see why honda made a new T breather to go with hrc power up kit. I didnt get one... what sizes drill bit should i use? I wouldnt know how much i need to cut out, so that's why i asked on sizes on the bit.