I have for sale my S15 turbo I previously ran o my redtop. Worked fine for me and only shows minimal shaft play. I had to use a compressor housing clamp for another turbo in a pinch but you can get them from ATP. Yes it is a spec r bb turbo as confirmed by the part number in the picture which reads 14411-91F00
$500 which includes shipping and paypal fees. You can pm me on here or text me at 4107031321 for the fastest response.