Called Weiand today.

they used to advertise it at 1500-7000 rpm. lol

it's a good piece....but my LD340 is the ticket in my combo of parts, basically picked up bottom end/mid range by switching to the ld340 over the x ellerator and with seemingly no sacrifice to the top end.
But rev it or 'live' in the 4500 and up RPM range and the weiand takes over.

so...basically, if you shift 7500 rpm, go with the weiand x ellerator