Recirc Dump valve?
 

Can you buy an uprated recirculating dumpvalve?

Yes you can, you probably dont need one though...

yes you can, believe the standard ones struggle at high bhp. if your not going that far then standard is fine

Running 252bhp at the min. And had a Vta on there to combat the mamouth turbo stall through gear changes. Put the recirc back on after all the recent chat and its just not good enough and venting the presure. Jus trying to find a happy medium. Power is due to go up to 320bhp very soon.

My newage is runnin 318bhp and has not a single problem with standard recirc.
My classic was running 280bhp and also didn't have any problems with the standard recirc.

My MY00 Classic is running 360bhp with a standard 97/98 recirc DV and no probs and it sounds great :D

I think your problems may well lie elsewhere other than the Diverter Valve:D

The newage modifications official article on this site was pushing 361 by the time they finished and no mention of having to change the recirc. Come tho think of it they didnt go for FMIC either tho. yet....

The most common replacement recirc seems to be the Forge from what I've read.