AE92's (sx) when u lower them (i had compressed king super lows) over 17 x7" rims (215 tyres) will scrub the gaurds.
You just need to get the rear arches lipped, and the front just remove the arch plastic inners.
No need to go 2.5", i had a 2 1/4" mandral with 2/4/1 extractors and i lost power over the 2" system.