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We use modified IPD arrangements on most Stage II engines. In my experience, until you add 400ccs, a point of compression, some real port work and etc , the gains are minimal.
I have seen stock engines make less power with them, back to back on the dyno.
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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