I was reading up on TB spacer and their purpose the other day. Supposedly their purpose is to increase the size of the plenum of the IM. I have heard many ppl say that those are worthless on here. However I look back at that RLZ manifold with the enlarged plenum size and the power it made. So to me it seems like we might be able to benefit from this small modification. Let me know what you guys think.

 

ill let you know after i install it and dyno

 

i guess it would depend on the tb spacer size. i did a dyno run with it on and then pulled it off for s's&g's and the spacer was causing my to loose power from 4500 to 6500 rpm. but this was the helix spacer which was only about 54mm.