does anyone know where i can find a 3'' v clamp down pipe of my rx7....

 

for the stock turbo you can't easily do that due to the 3 bolt flange on the turbine housing outlet.

 

If you convert it.,By making an adapter from the stock 3 bolt to 3 inch v-band.then it is possible.
Use the adapter,by a 3 inch vband pipe and you can put about anything turbo in there.But it is just spending money where it is not needed.
\By the Way there are 3 inch Downpipes available with the stock 3 bolt flange..Racing Beat sells them.

 

cut a downpipe made for the stock turbo flange off and weld on a v-band adapter to it and to the turbo outlet. have a customer who has this done to the stock turbo and seems to work just fine.