well...I'm selling my GT3257e. It has about 4,500-5,000 miles. It has a mitsu exhaust housing, divided for WG in o2 housing. It spooled up 20psi at about 3,900-4000...I really never checked exactly the rpm's but that's around. It spools a bit faster than a 50 trim according to my friend, who has a 50 trim and drove mine. Well...I'm selling it for about $650. Pm me if interested, thanks