I jsut used a cutting wheel on a dremel, worked pretty fine threw plastic and metal. I did a muzzys system and it used a special bar theat they made specific for the 10r so its way different than your mps system, I'd say go behind the air filter though if you spray.
If you have a solo cap on the back, you can cut one of the wings on the subframe off flush. Then the bottle will fit perfectly down in the trunk sideways. (run your line through the tail section and it will work perfect. That is how i done mine. it worked great with out to much gutting. just cut that tab and you will be in good shape.
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