Hi Dom, I would suggest just simply install a FOD guard on your P-70 and go fly without a worry....
IMHO a bypass is really not of any advantage on models at the speeds we are operating at i.e. sub 200 mph. For a bypass to offer any significant performance advantage ideally the intake duct shape/design, bypass itself and your tail pipe specification ALL need to be designed/optimized around your specific engine and airframe combo... I believe by simply adding a generic bypasses offers no real measurable 'performance' advantage per say especially in the 'slower' flying (sub 200mph) jet airframes and this to best of my knowledge has been proven to be the case, It really requires an optimized package intake/bypass/pipe overall for each engine/airframe I reckon regardless to show a measurable benefit. That said tailpipe design can dramatically effect thrust and cooling also.... but thats another story!

Cheers-