Extrude Hone will open up the UIM's passages by about 1 - 1.5mm (If you've got a UIM that's been honed twice already i.e. 2000 SVT ). The passages should be smoothened (is that a word? ) up too.
Derek
Scion xB 5-spd
Previous: 2000 Silver Frost SVT
Please share the road with cyclists.
). The passages should be smoothened (is that a word? 
) up too. 
