I was trying to keep the rake about the same. If the 305's enough for track use that's a bunch of tire up front  .
My thoughts were
275/ 35 = 25.2 dia - width 11.2
305/ 30 = 25.6 did - width 12.4
In the front I thought the 275 would give a better turning radius and help keep the rake the same without re-adjusting the ride height/re-align, yada,yada. The diameter diff on the stock tires is about .5. This gets me close at .4.
335 /30 - 25.6 dia - Width 13.5 The question is will the 335's actually fit on the rim with no clearance issues with the rear scoops, wheel wells, etc?
When you run the 305/30 front and 335/30 rear on Rocket Sleds calculator, it actually looks like this would be a better set up. Delta is -.3% vs. -1.7% for the combo of 275/35 & 305/30.
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04 MS. 361 rwhp .ET 12.44 @116.5 mph. Cryo, PFC01, DRM /PHX, T1 bars, BK HB, Crow, Forza,170stat, Hardbar Knob, Cags, Redline, Vram,Chromes,3m Bra, Lowered 1". Goodyear GSCS F1's & R370 Eagles
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