I'm in the premod mode for one of my vehicles and one of the things I'll be adding are a set offroad tires by Interco Thornbird . I've ran these tires on both my 72 Lancruiser and my 56 Chevy SB but I'm now going to put a set on a Truck that will at times see the highway and rain so I'm thinking that grooving them might be a great idea and I found a couple of good articles and this groover for $70 that I just ordered so I'm good to go.Nac's Racing Motorsports Shopping Cart just click on parts or search for tire groover.
Toyota Tech: Siping Tires

Tech: Grooving Tires

Tire Siping

For the racers out there.

Hoosier Tire

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I've grooved a set of 38x12.50x15 Super Swamper TSL's for trail riding and rock crawling and it really made those tires work better. It really loosened up the carcass and let the tires flex better when aired down. I don't remember the brand of grooving iron I used, a buddy of mine had a $70 groover and it worked fine, took about an hour per tire to get the pattern I wanted.

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Black, '07 Tundra DC, SR5, 5.7, 4x4, tow pkg

Will this help with road noise of heavy tread tires? The whine from the rubber on the highway can get annoying when you have deep tread tires.

I didn't notice much difference in the road noise, but then again this was on an open top heep that doesn't see much highway time. When it did get on the street there was so much other noise, wind, exhaust etc., that tire noise changes aren't very noticable. But then again, I'm one of those wierdo's that like the sound of an agressive tire on pavement