Few custom parts

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83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i
I was really looking into just making a few parts for my p5 such as a 4-2-1 header/possibly turbo manifold, and 60a poly mounts. If I were to be successful would anyone be interested in one as well?

I don't know anything for prices yet but I can obviously get everything cheaper if I buy in bulk.
 
After more research on the Polly mounts I can do both 60a and 80a. Looks like I can put everything together for about $45 each mount
 
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