Personally,

From the look at the website and the quality of whats for sale, I wouldn't trust them.

http://www.magnumtuning.com/carperfo...iimter_400.jpg

Looking at that link, from a company that can't spell Limiter on their products suggests they don't have much attention to detail.

and when they're selling stuff like Twist Air...

http://www.magnumtuning.com/en/produ..._saver_spiral3

I mean, how dubious does that look?

I'd love to see a car build with their mods on a dyno.

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.