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I put a Guarder bearing spring guide in my MP5 with a PDI 150% spring shooting a pretty consistant 352fps, and my velocity went up to 370fps with 0.20g BBs and hop up off (hop up on, sat at 365fps). So a bearing spring guide WILL add to your fps, but not a huge amount, 10-15fps if lucky (also found a 15fps increase in my CA M24 with the addition of a bearing spring guide).
And it doesn't really matter the brand you buy, just as long as it's meant for the version of mechbox you have (in your case, a version 2). They are also made out of solid metal, so you won't run any chance of a broken spring guide (I've seen 2 TM stock spring guides bust, a bearing one is a good reliability upgrade).
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