I just got rid of a 1999 Mazda Miata to get my Crossfire, but one thing I always fantasized about (besides Jessica Alba, but that's for a different forum...ahem) was dropping the 2.4L Stage 1 equipped engine from my PT Cruiser Turbo into that little Miata. Very minor weight penalty but a jump from 140 HP/119 lb-ft to 240 HP/265 lb-ft. Yeee-haaawww!!!