factory hand built 3.2 litre v-6 with a lysolm s/c. minimal bolt on mods gets you 350 rwhp and 350 ft/lbs torque. if you want a coupe AND convertible look at the older brother the slk32. theres a pristine slk32 in wine color with red /black interior for sale in texas
theres also more than a couple srt-6's for sale on here
GOOD LUCK!!!