CAWiki talk:Speed Gear/@comment-25795716-20150706235424/@comment-20761847-20150709164632

I would think the maximum would be +33.6% since you have your recon vest at +15%, apparently it allows you to put two mods on it so +0.9 x 2 , your FurtureX recon helmet which allows you to also put two mods on so +0.9 x 2, and the rest of your gear. so 15 + 3 + 8 + 4 + 0.9 x 4 = +33.6 With mutagen in quarantine games it would be +33.6%?

I'm not sure if you can stack the tier II mods (0.9) of the same kind on the items since I havn't wanted to open my gear items and use nx to test. You might only be allowed to stack different mods, so you would have to use a tier I (0.7) and a tier II speed mod on your 2 x 2 available slots (FurtureX recon helmet and Recon Vest)