old school hks blow off valve

[alex_s817]

Works great, just decided it was time for something new.
Comes with adapter pipe. Looking to get $100 obo + shipping and paypal fees.
Thanks
-Alex

http://i199.photobucket.com/albums/aa168/alex_s817/2011-04-09_20-53-01_933.jpg

[silviaks2nr]

what diameter is the section of pipe that the flange is welded to? Is it aluminum or steel?