Definitely go HP with it, where it's max wheel size allowed is 13x7". Pretty much any of the available 13" race tires can be put onto a 6" wheel, but they're a bit pinched onto that narrow width, so geometry of putting them onto a 7" wide wheel is certainly better. On all of my ITC/ITB/HP Honda's I've had, they've only been allowed a 13x6" wheel, and I've never had any issue with it, but yes a 7" width would definitely be more desirable.
As for offset, if you're comfortably fitting a +32 offset right now, then it's really up to you if you want to go the "body flares + bigger offset" route. As the radial slicks become more prominent in Prod, the wider fenders aren't seeming to be as necessary, since the tires don't need as much room under the fender to work as the old bias-ply tires do/did. On a lower horsepower can like an HP car, I actually wonder if it would be more beneficial to keep the narrower stock fenders on the car, and keep that frontal area and drag numbers lower than what you'll get with the wide fenders. If you do decide to go with the fender flares, then yes, something like a +0 or +10 offset would probably work, depending on just how flared they are. For your classification in HP, your mas wheel track is 56.0 front & 55.5 rear (measured middle of tire to middle of tire), so you just have to stay under that.
Kevin
2010 FP Runoffs & Super Sweep Champion
2010 ITB ARRC Champion
2008 & 2009 ITA ARRC Champion
'90 FP Acura Integra RS
'92 ITA Acura Integra RS
'92 ITB Honda Civic DX
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