Spoony,
I have both- polished 15" Trigo's and polished 17" PSE's. The most pressing problem with the 15's is quality of tire(
pr lack of it) and the massive torque down low that a 460 produces that will cause excessive wheelspin under 50mph. I run 285-40-ZR17 fronts and 335-35-ZR17 rears- Michelin Pilot Sports . I switched back to the 15's for a few weeks while waiting for a new set of rear tires to come in, and remembered just how scary they can be. All it takes to run the 335's is a good 4 wheel alignment set to SPF specs with a bit of negative camber in the rear.
They stick, and are worth the extra expense, expecially if you EVER put the car on a track of any kind.
John Russell
SPF # 586