im thinking about adding a grounding wire set...
does it improve in power like it says?
or is it all bs
where would be a great place to buy it?
danks

 

www.blehmco.com

no they're not all BS.

 

is there any downs in using the wires?

 

more things in the engine bay is about it.

 

I made my own, and didn't notice any difference in performance, starting, or shift quality. But I also keep my factory grounds in good shape. As long as you install it properly, it won't cause any problems, and if your current ground points are corroded or falling off, then you will probably have noticable benefits.